diff --git a/MANIFEST.in b/MANIFEST.in
index e4d7a2ff3..d73a81fe1 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,7 +1,6 @@
 include *.txt
 include babel.cfg
 include LICENSE
-include bin/preinstall.js
 recursive-include sphinx_rtd_theme *.conf
 recursive-include sphinx_rtd_theme *.css
 recursive-include sphinx_rtd_theme *.eot
diff --git a/bin/preinstall.js b/bin/preinstall.js
deleted file mode 100755
index 536fe5a3f..000000000
--- a/bin/preinstall.js
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env node
-
-const package = require('../package.json');
-
-// Sorry everyone, this is the closest we can get to commenting on package.json
-// dependencies :(
-if (package.devDependencies['bourbon-neat'] !== '~1.9') {
-    // Wyrm is not compatible with Neat 2.0+, and Neat 1.9 at least pins a
-    // node-sass version that doesn't require Python 2. The changes to Wyrm to
-    // support Neat 2.0+ are all fairly minor changes, but it deeply affects the
-    // grid system and might be more of a liability than an old release of Neat.
-    // See: https://github.com/readthedocs/sphinx_rtd_theme/pull/771
-    console.error(
-        'bourbon-neat 1.9 is required, Wyrm is not compatible with Neat 2.0+.'
-    );
-    console.error(
-        'The expected selector for the bourbon-neat dependency in package.json is "~1.9".'
-    );
-    process.exit(1);
-}
diff --git a/docs/contributing.rst b/docs/contributing.rst
index 5f0245110..6267e8108 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -59,7 +59,6 @@ can be used to test built assets:
 .. _Webpack: https://webpack.js.org/
 .. _node-sass: https://github.com/sass/node-sass
 .. _SASS: http://www.sass-lang.com
-.. _Wyrm: http://www.github.com/snide/wyrm/
 .. _Sphinx: http://www.sphinx-doc.org/en/stable/
 
 Translations
diff --git a/package-lock.json b/package-lock.json
index a3cd15d7e..9dd025a46 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -227,12 +227,6 @@
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       "dev": true
     },
-    "abbrev": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-      "dev": true
-    },
     "accepts": {
       "version": "1.3.7",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
@@ -279,12 +273,6 @@
       "integrity": "sha1-l6ERlkmyEa0zaR2fn0hqjsn74KM=",
       "dev": true
     },
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-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
-    },
     "ansi-colors": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.4.tgz",
@@ -303,12 +291,6 @@
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       "dev": true
     },
-    "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
-    },
     "anymatch": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
@@ -336,16 +318,6 @@
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       "dev": true
     },
-    "are-we-there-yet": {
-      "version": "1.1.5",
-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
-      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
-      "dev": true,
-      "requires": {
-        "delegates": "^1.0.0",
-        "readable-stream": "^2.0.6"
-      }
-    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -373,12 +345,6 @@
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
-    "array-find-index": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
-      "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
-      "dev": true
-    },
     "array-flatten": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-2.1.2.tgz",
@@ -406,15 +372,6 @@
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
       "dev": true
     },
-    "asn1": {
-      "version": "0.2.4",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
-      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
-      "dev": true,
-      "requires": {
-        "safer-buffer": "~2.1.0"
-      }
-    },
     "asn1.js": {
       "version": "4.10.1",
       "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
@@ -453,12 +410,6 @@
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       }
     },
-    "assert-plus": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
-      "dev": true
-    },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
@@ -480,42 +431,18 @@
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       "dev": true
     },
-    "async-foreach": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/async-foreach/-/async-foreach-0.1.3.tgz",
-      "integrity": "sha1-NhIfhFwFeBct5Bmpfb6x0W7DRUI=",
-      "dev": true
-    },
     "async-limiter": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
       "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==",
       "dev": true
     },
-    "asynckit": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
-      "dev": true
-    },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
       "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
       "dev": true
     },
-    "aws-sign2": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
-      "dev": true
-    },
-    "aws4": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.9.1.tgz",
-      "integrity": "sha512-wMHVg2EOHaMRxbzgFJ9gtjOOCrI80OHLG14rxi28XwOW8ux6IiEbRCGGGqCtdAIg4FQCbW20k9RsT4y3gJlFug==",
-      "dev": true
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       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -589,15 +516,6 @@
       "integrity": "sha1-3DQxT05nkxgJP8dgJyUl+UvyXBY=",
       "dev": true
     },
-    "bcrypt-pbkdf": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
-      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
-      "dev": true,
-      "requires": {
-        "tweetnacl": "^0.14.3"
-      }
-    },
     "big.js": {
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       "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",
@@ -620,15 +538,6 @@
         "file-uri-to-path": "1.0.0"
       }
     },
-    "block-stream": {
-      "version": "0.0.9",
-      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
-      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
-      "dev": true,
-      "requires": {
-        "inherits": "~2.0.0"
-      }
-    },
     "bluebird": {
       "version": "3.7.2",
       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz",
@@ -693,21 +602,12 @@
       "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
       "dev": true
     },
-    "bourbon": {
-      "version": "4.3.4",
-      "resolved": "https://registry.npmjs.org/bourbon/-/bourbon-4.3.4.tgz",
-      "integrity": "sha1-TaOAAp6SwMj5dkx3lFGhNLEefMM=",
+    "bootstrap": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.6.0.tgz",
+      "integrity": "sha512-Io55IuQY3kydzHtbGvQya3H+KorS/M9rSNyfCGCg9WZ4pyT/lCxIlpJgG1GXW/PswzC84Tr2fBYi+7+jFVQQBw==",
       "dev": true
     },
-    "bourbon-neat": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/bourbon-neat/-/bourbon-neat-1.9.1.tgz",
-      "integrity": "sha512-W4gjJx1j+KPNF8Bg/3ecaTHPMC7IJ2pFKmYEZanWtzFk9MpM9kn+f14iXypIj8htHMRmzVByhzFhVWwuDKSTYg==",
-      "dev": true,
-      "requires": {
-        "node-sass": "^4.1.1"
-      }
-    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -963,22 +863,6 @@
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-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
-      "dev": true
-    },
-    "camelcase-keys": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
-      "integrity": "sha1-MIvur/3ygRkFHvodkyITyRuPkuc=",
-      "dev": true,
-      "requires": {
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-      }
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@@ -997,25 +881,6 @@
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       "dev": true
     },
-    "caseless": {
-      "version": "0.12.0",
-      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
-      "dev": true
-    },
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-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^2.2.1",
-        "escape-string-regexp": "^1.0.2",
-        "has-ansi": "^2.0.0",
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-        "supports-color": "^2.0.0"
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@@ -1084,71 +949,6 @@
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-      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
-      "dev": true,
-      "requires": {
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-        "strip-ansi": "^5.2.0",
-        "wrap-ansi": "^5.1.0"
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-          "dev": true
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-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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@@ -1253,15 +1053,6 @@
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@@ -1480,16 +1265,6 @@
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@@ -1866,18 +1623,6 @@
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@@ -2035,16 +1780,6 @@
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-      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
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-      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
-      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q==",
-      "dev": true
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       "resolved": "https://registry.npmjs.org/spdy/-/spdy-4.0.1.tgz",
@@ -7093,23 +6237,6 @@
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-      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
-      "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
-      "dev": true,
-      "requires": {
-        "asn1": "~0.2.3",
-        "assert-plus": "^1.0.0",
-        "bcrypt-pbkdf": "^1.0.0",
-        "dashdash": "^1.12.0",
-        "ecc-jsbn": "~0.1.1",
-        "getpass": "^0.1.1",
-        "jsbn": "~0.1.0",
-        "safer-buffer": "^2.0.2",
-        "tweetnacl": "~0.14.0"
-      }
-    },
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       "resolved": "https://registry.npmjs.org/ssri/-/ssri-6.0.1.tgz",
@@ -7152,15 +6279,6 @@
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       "dev": true
     },
-    "stdout-stream": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/stdout-stream/-/stdout-stream-1.4.1.tgz",
-      "integrity": "sha512-j4emi03KXqJWcIeF8eIXkjMFN1Cmb8gUlDYGeBALLPo5qdyTfA9bOtl8m33lRoC+vFMkP3gl0WsDr6+gzxbbTA==",
-      "dev": true,
-      "requires": {
-        "readable-stream": "^2.0.1"
-      }
-    },
     "stream-browserify": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/stream-browserify/-/stream-browserify-2.0.2.tgz",
@@ -7255,30 +6373,12 @@
         "ansi-regex": "^2.0.0"
       }
     },
-    "strip-bom": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
-      "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
-      "dev": true,
-      "requires": {
-        "is-utf8": "^0.2.0"
-      }
-    },
     "strip-eof": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
-    "strip-indent": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
-      "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
-      "dev": true,
-      "requires": {
-        "get-stdin": "^4.0.1"
-      }
-    },
     "style-loader": {
       "version": "0.23.1",
       "resolved": "https://registry.npmjs.org/style-loader/-/style-loader-0.23.1.tgz",
@@ -7313,12 +6413,6 @@
         }
       }
     },
-    "supports-color": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-      "dev": true
-    },
     "svgo": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/svgo/-/svgo-1.3.2.tgz",
@@ -7377,17 +6471,6 @@
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       "dev": true
     },
-    "tar": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.2.tgz",
-      "integrity": "sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==",
-      "dev": true,
-      "requires": {
-        "block-stream": "*",
-        "fstream": "^1.0.12",
-        "inherits": "2"
-      }
-    },
     "terser": {
       "version": "4.6.3",
       "resolved": "https://registry.npmjs.org/terser/-/terser-4.6.3.tgz",
@@ -7517,31 +6600,6 @@
       "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==",
       "dev": true
     },
-    "tough-cookie": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
-      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
-      "dev": true,
-      "requires": {
-        "psl": "^1.1.28",
-        "punycode": "^2.1.1"
-      }
-    },
-    "trim-newlines": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
-      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
-      "dev": true
-    },
-    "true-case-path": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/true-case-path/-/true-case-path-1.0.3.tgz",
-      "integrity": "sha512-m6s2OdQe5wgpFMC+pAJ+q9djG82O2jcHPOI6RNg1yy9rCYR+WD6Nbpl32fDpfC56nirdRy+opFa/Vk7HYhqaew==",
-      "dev": true,
-      "requires": {
-        "glob": "^7.1.2"
-      }
-    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
@@ -7554,21 +6612,6 @@
       "integrity": "sha1-oVe6QC2iTpv5V/mqadUk7tQpAaY=",
       "dev": true
     },
-    "tunnel-agent": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
-      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "^5.0.1"
-      }
-    },
-    "tweetnacl": {
-      "version": "0.14.5",
-      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true
-    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -7785,16 +6828,6 @@
       "integrity": "sha512-CNmdbwQMBjwr9Gsmohvm0pbL954tJrNzf6gWL3K+QMQf00PF7ERGrEiLgjuU3mKreLC2MeGhUsNV9ybTbLgd3w==",
       "dev": true
     },
-    "validate-npm-package-license": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
-      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
-      "dev": true,
-      "requires": {
-        "spdx-correct": "^3.0.0",
-        "spdx-expression-parse": "^3.0.0"
-      }
-    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -7807,17 +6840,6 @@
       "integrity": "sha512-fOi47nsJP5Wqefa43kyWSg80qF+Q3XA6MUkgi7Hp1HQaKDQW4cQrK2D0P7mmbFtsV1N89am55Yru/nyEwRubcw==",
       "dev": true
     },
-    "verror": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "dev": true,
-      "requires": {
-        "assert-plus": "^1.0.0",
-        "core-util-is": "1.0.2",
-        "extsprintf": "^1.2.0"
-      }
-    },
     "vm-browserify": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.2.tgz",
@@ -8419,21 +7441,6 @@
         "isexe": "^2.0.0"
       }
     },
-    "which-module": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
-    },
-    "wide-align": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
-      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
-      "dev": true,
-      "requires": {
-        "string-width": "^1.0.2 || 2"
-      }
-    },
     "worker-farm": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.7.0.tgz",
@@ -8468,12 +7475,6 @@
         "async-limiter": "~1.0.0"
       }
     },
-    "wyrm": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/wyrm/-/wyrm-1.0.9.tgz",
-      "integrity": "sha1-tB2G8E0APS6IhbRUEUbzl2IhoGI=",
-      "dev": true
-    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
@@ -8485,109 +7486,6 @@
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
       "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
       "dev": true
-    },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
-    },
-    "yargs": {
-      "version": "13.3.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
-      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
-      "dev": true,
-      "requires": {
-        "cliui": "^5.0.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^2.0.1",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^3.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.2"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "find-up": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
-          "dev": true,
-          "requires": {
-            "locate-path": "^3.0.0"
-          }
-        },
-        "get-caller-file": {
-          "version": "2.0.5",
-          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
-          "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
-          "dev": true
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
-        "require-main-filename": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
-          "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
-          "dev": true
-        },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
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-          }
-        },
-        "y18n": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-          "dev": true
-        }
-      }
-    },
-    "yargs-parser": {
-      "version": "13.1.2",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
-      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "5.3.1",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
-          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
-          "dev": true
-        }
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index 300c91b3b..dcedac6d1 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,7 @@
   "version": "0.5.1",
   "scripts": {
     "dev": "webpack-dev-server --open --config webpack.dev.js",
-    "build": "webpack --config webpack.prod.js",
-    "preinstall": "bin/preinstall.js"
+    "build": "webpack --config webpack.prod.js"
   },
   "repository": {
     "type": "git",
@@ -19,20 +18,19 @@
   "homepage": "https://github.com/readthedocs/sphinx_rtd_theme",
   "dependencies": {},
   "devDependencies": {
-    "bourbon": "~4.3",
-    "bourbon-neat": "~1.9",
+    "bootstrap": "^4.6.0",
     "copy-webpack-plugin": "^5.1.1",
     "css-loader": "^3.1.0",
     "file-loader": "^3.0.1",
     "font-awesome": "^4.7.0",
-    "html5shiv": "^3.7.3",
     "imports-loader": "^0.8.0",
     "jquery": "^3.4.1",
     "lato-font": "^3.0.0",
     "mini-css-extract-plugin": "^0.6.0",
-    "node-sass": "^4.13.1",
     "optimize-css-assets-webpack-plugin": "^5.0.3",
+    "popper.js": "^1.16.1",
     "roboto-fontface": "^0.10.0",
+    "sass": "^1.32.8",
     "sass-loader": "^7.3.0",
     "style-loader": "^0.23.1",
     "webpack": "^4.30.0",
@@ -40,7 +38,6 @@
     "webpack-dev-server": "^3.3.1",
     "webpack-merge": "^4.2.1",
     "webpack-shell-plugin": "^0.5.0",
-    "webpack-watch-files-plugin": "^1.0.3",
-    "wyrm": "^1.0.9"
+    "webpack-watch-files-plugin": "^1.0.3"
   }
 }
diff --git a/sphinx_rtd_theme/breadcrumbs.html b/sphinx_rtd_theme/breadcrumbs.html
index 0ec35f502..e852c81c9 100644
--- a/sphinx_rtd_theme/breadcrumbs.html
+++ b/sphinx_rtd_theme/breadcrumbs.html
@@ -27,16 +27,17 @@
 {%- set display_vcs_links = display_vcs_links if display_vcs_links is defined else True %}
 
 <div role="navigation" aria-label="{{ _('Breadcrumbs') }}">
-  <ul class="wy-breadcrumbs">
+
+  <ol class="breadcrumb">
     {%- block breadcrumbs %}
-      <li><a href="{{ pathto(master_doc) }}" class="icon icon-home"></a> &raquo;</li>
-        {%- for doc in parents %}
-          <li><a href="{{ doc.link|e }}">{{ doc.title }}</a> &raquo;</li>
-        {%- endfor %}
-      <li>{{ title }}</li>
+      <li class="breadcrumb-item"><a href="{{ pathto(master_doc) }}" class="icon icon-home"></a></li>
+      {%- for doc in parents %}
+        <li class="breadcrumb-item"><a href="{{ doc.link|e }}">{{ doc.title }}</a></li>
+      {%- endfor %}
+      <li class="breadcrumb-item active">{{ title }}</li>
     {%- endblock %}
     {%- block breadcrumbs_aside %}
-      <li class="wy-breadcrumbs-aside">
+      <li class="breadcrumb-aside">
         {%- if hasdoc(pagename) and display_vcs_links %}
           {%- if display_github %}
             {%- if check_meta and 'github_url' in meta %}
@@ -67,15 +68,15 @@
         {%- endif %}
       </li>
     {%- endblock %}
-  </ul>
+  </ol>
 
   {%- if (theme_prev_next_buttons_location == 'top' or theme_prev_next_buttons_location == 'both') and (next or prev) %}
   <div class="rst-breadcrumbs-buttons" role="navigation" aria-label="{{ _('Breadcrumbs') }}">
       {%- if prev %}
-        <a href="{{ prev.link|e }}" class="btn btn-neutral float-left" title="{{ prev.title|striptags|e }}" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> {{ _('Previous') }}</a>
+        <a href="{{ prev.link|e }}" class="btn btn-light float-left" title="{{ prev.title|striptags|e }}" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> {{ _('Previous') }}</a>
       {%- endif %}
       {%- if next %}
-        <a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}" accesskey="n">{{ _('Next') }} <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
+        <a href="{{ next.link|e }}" class="btn btn-light float-right" title="{{ next.title|striptags|e }}" accesskey="n">{{ _('Next') }} <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
       {%- endif %}
   </div>
   {%- endif %}
diff --git a/sphinx_rtd_theme/footer.html b/sphinx_rtd_theme/footer.html
index 44c7aeb3d..6d33728ef 100644
--- a/sphinx_rtd_theme/footer.html
+++ b/sphinx_rtd_theme/footer.html
@@ -2,10 +2,10 @@
   {%- if (theme_prev_next_buttons_location == 'bottom' or theme_prev_next_buttons_location == 'both') and (next or prev) %}
     <div class="rst-footer-buttons" role="navigation" aria-label="{{ _('Footer') }}">
       {%- if prev %}
-        <a href="{{ prev.link|e }}" class="btn btn-neutral float-left" title="{{ prev.title|striptags|e }}" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> {{ _('Previous') }}</a>
+        <a href="{{ prev.link|e }}" class="btn btn-light float-left" title="{{ prev.title|striptags|e }}" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> {{ _('Previous') }}</a>
       {%- endif %}
       {%- if next %}
-        <a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}" accesskey="n" rel="next">{{ _('Next') }} <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
+        <a href="{{ next.link|e }}" class="btn btn-light float-right" title="{{ next.title|striptags|e }}" accesskey="n" rel="next">{{ _('Next') }} <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
       {%- endif %}
     </div>
   {%- endif %}
diff --git a/sphinx_rtd_theme/layout.html b/sphinx_rtd_theme/layout.html
index bbfdbff6a..c823b79ab 100644
--- a/sphinx_rtd_theme/layout.html
+++ b/sphinx_rtd_theme/layout.html
@@ -6,11 +6,10 @@
 {%- else %}
   {%- set titlesuffix = "" %}
 {%- endif %}
-{%- set lang_attr = 'en' if language == None else (language | replace('_', '-')) %}
-{%- set sphinx_writer = 'writer-html5' if html5_doctype else 'writer-html4' -%}
+{%- set lang_attr = 'en' if language == None else (language | replace('_', '-')) -%}
 
 <!DOCTYPE html>
-<html class="{{ sphinx_writer }}" lang="{{ lang_attr }}" >
+<html lang="{{ lang_attr }}" >
 <head>
   <meta charset="utf-8" />
   {{- metatags }}
@@ -51,9 +50,6 @@
 
   {#- JAVASCRIPTS #}
   {%- block scripts %}
-  <!--[if lt IE 9]>
-    <script src="{{ pathto('_static/js/html5shiv.min.js', 1) }}"></script>
-  <![endif]-->
   {%- if not embedded %}
   {# XXX Sphinx 1.8.0 made this an external js-file, quick fix until we refactor the template to inherert more blocks directly from sphinx #}
     {%- if sphinx_version >= "1.8.0" -%}
@@ -111,22 +107,23 @@
   {%- block extrahead %} {% endblock %}
 </head>
 
-<body class="wy-body-for-nav">
-
+<body>
   {%- block extrabody %} {% endblock %}
-  <div class="wy-grid-for-nav">
-    {#- SIDE NAV, TOGGLES ON MOBILE #}
-    <nav data-toggle="wy-nav-shift" class="wy-nav-side">
-      <div class="wy-side-scroll">
-        <div class="wy-side-nav-search" {% if theme_style_nav_header_background %} style="background: {{theme_style_nav_header_background}}" {% endif %}>
-          {%- block sidebartitle %}
 
+  <div class="d-flex" id="wrapper">
+
+    <!-- Sidebar -->
+    <div class="sidebar-right" id="sidebar-wrapper">
+      <div class="sidebar-scroll">
+        <div class="sidebar-heading">
+          {%- block sidebartitle %}
+ 
           {%- if logo and theme_logo_only %}
             <a href="{{ pathto(master_doc) }}">
           {%- else %}
             <a href="{{ pathto(master_doc) }}" class="icon icon-home"> {{ project }}
           {%- endif %}
-
+ 
           {%- if logo %}
             {#- Not strictly valid HTML, but it's the only way to display/scale
                 it properly, without weird scripting or heaps of work
@@ -134,7 +131,7 @@
             <img src="{{ pathto('_static/' + logo, 1) }}" class="logo" alt="{{ _('Logo') }}"/>
           {%- endif %}
           </a>
-
+ 
           {%- if theme_display_version %}
             {%- set nav_version = version %}
             {%- if READTHEDOCS and current_version %}
@@ -146,14 +143,14 @@
               </div>
             {%- endif %}
           {%- endif %}
-
+ 
           {%- include "searchbox.html" %}
-
+ 
           {%- endblock %}
         </div>
 
         {%- block navigation %}
-        <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="{{ _('Main') }}">
+        <div class="sidebar-navigation" data-spy="affix" role="navigation" aria-label="{{ _('Main') }}">
           {%- block menu %}
             {%- set toctree = toctree(maxdepth=theme_navigation_depth|int,
                                       collapse=theme_collapse_navigation|tobool,
@@ -166,48 +163,49 @@
               <div class="local-toc">{{ toc }}</div>
             {%- endif %}
           {%- endblock %}
-        </div>
-        {%- endblock %}
+       </div>
+       {%- endblock %}
       </div>
-    </nav>
-
-    <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
+    </div>
+    <!-- /#sidebar-wrapper -->
 
-      {#- MOBILE NAV, TRIGGLES SIDE NAV ON TOGGLE #}
-      <nav class="wy-nav-top" aria-label="{{ _('Top') }}">
+    <!-- Page Content -->
+   <div class="page-content-wrapper">
+      <nav class="wy-nav-top navbar navbar-expand-lg navbar-light bg-light border-bottom" aria-label="{{ _('Top') }}">
         {%- block mobile_nav %}
-          <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
-          <a href="{{ pathto(master_doc) }}">{{ project }}</a>
+           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
+           <a href="{{ pathto(master_doc) }}">{{ project }}</a>
         {%- endblock %}
       </nav>
 
-      <div class="wy-nav-content">
-      {%- block content %}
-        {%- if theme_style_external_links|tobool %}
-        <div class="rst-content style-external-links">
-        {%- else %}
-        <div class="rst-content">
-        {%- endif %}
-          {% include "breadcrumbs.html" %}
-          <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
-          {%- block document %}
-           <div itemprop="articleBody">
-             {% block body %}{% endblock %}
-           </div>
-           {%- if self.comments()|trim %}
-             <div class="articleComments">
+      <div class="container-fluid">
+         {%- block content %}
+           {%- if theme_style_external_links|tobool %}
+           <div class="rst-content style-external-links">
+           {%- else %}
+           <div class="rst-content">
+           {%- endif %}
+             {% include "breadcrumbs.html" %}
+             <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
+             {%- block document %}
+              <div itemprop="articleBody">
+               {% block body %}{% endblock %}
+              </div>
+              {%- if self.comments()|trim %}
+              <div class="articleComments">
                {%- block comments %}{% endblock %}
+              </div>
+              {%- endif%}
              </div>
-           {%- endif%}
-          </div>
-          {%- endblock %}
-          {% include "footer.html" %}
-        </div>
-      {%- endblock %}
+             {%- endblock %}
+             {%- include "footer.html" %}
+           </div>
+         {%- endblock %}
       </div>
-    </section>
+    </div>
+    <!-- /#page-content-wrapper -->
   </div>
-  {% include "versions.html" -%}
+  {%- include "versions.html" -%}
 
   <script type="text/javascript">
       jQuery(function () {
diff --git a/sphinx_rtd_theme/searchbox.html b/sphinx_rtd_theme/searchbox.html
index bc3ee5f0d..cf3fe6985 100644
--- a/sphinx_rtd_theme/searchbox.html
+++ b/sphinx_rtd_theme/searchbox.html
@@ -1,7 +1,7 @@
 {%- if 'singlehtml' not in builder %}
-<div role="search">
-  <form id="rtd-search-form" class="wy-form" action="{{ pathto('search') }}" method="get">
-    <input type="text" name="q" placeholder="{{ _('Search docs') }}" />
+<div class="form-outline" role="search">
+  <form id="rtd-search-form" action="{{ pathto('search') }}" method="get">
+    <input type="search" name="q" class="form-control" placeholder="{{ _('Search docs') }}" />
     <input type="hidden" name="check_keywords" value="yes" />
     <input type="hidden" name="area" value="default" />
   </form>
diff --git a/src/sass/_theme_badge.sass b/src/sass/_theme_badge.sass
index b24ec10f4..b461128b6 100644
--- a/src/sass/_theme_badge.sass
+++ b/src/sass/_theme_badge.sass
@@ -4,23 +4,23 @@
   left: 0
   width: $nav-desktop-width
   color: $section-background-color
-  background: darken($menu-background-color, 8%)
-  font-family: $base-font-family
-  z-index: $z-index-tray
+  background: darken($nav-background-color, 8%)
+  font-family: $font-family-base
+  z-index: $zindex-popover
   a
     color: $link_color
     text-decoration: none
   .rst-badge-small
     display: none
   .rst-current-version
-    padding: $base-line-height / 2
-    background-color: darken($menu-background-color, 5%)
+    padding: $line-height-base / 2
+    background-color: darken($nav-background-color, 5%)
     display: block
     text-align: right
     font-size: 90%
     cursor: pointer
     color: $green
-    +clearfix
+    @include clearfix
     .fa
       color: $section-background-color
     .fa-book
@@ -41,7 +41,7 @@
     display: block
   .rst-other-versions
     font-size: 90%
-    padding: $base-line-height / 2
+    padding: $line-height-base / 2
     color: $text-medium
     display: none
     hr
@@ -50,13 +50,13 @@
       border: 0
       margin: 20px 0
       padding: 0
-      border-top: solid 1px lighten($menu-background-color, 5%)
+      border-top: solid 1px lighten($nav-background-color, 5%)
     dd
       display: inline-block
       margin: 0
       a
         display: inline-block
-        padding: $base-line-height / 4
+        padding: $line-height-base / 4
         color: $section-background-color
   &.rst-badge
     width: auto
@@ -82,11 +82,11 @@
       width: auto
       height: 30px
       line-height: 30px
-      padding: 0 $base-line-height / 4
+      padding: 0 $line-height-base / 4
       display: block
       text-align: center
 
-+media($tablet)
+@media (max-width: $nav-media-query)
   .rst-versions
     width: 85%
     display: none
diff --git a/src/sass/_theme_badge_fa.sass b/src/sass/_theme_badge_fa.sass
index aa9f66290..9b2b4df6b 100644
--- a/src/sass/_theme_badge_fa.sass
+++ b/src/sass/_theme_badge_fa.sass
@@ -1,7 +1,5 @@
 // Slimmer version of FA for use on the badge_only.sass file.
 
-+font-face(FontAwesome, '#{$fa-font-path}/fontawesome-webfont')
-
 .fa:before
   display: inline-block
   font-family: FontAwesome
@@ -9,7 +7,6 @@
   font-weight: normal
   line-height: 1
   text-decoration: inherit
-  +font-smooth
 
 a .fa
   display: inline-block
diff --git a/src/sass/_theme_breadcrumbs.sass b/src/sass/_theme_breadcrumbs.sass
index fb5e022eb..2f08e03a0 100644
--- a/src/sass/_theme_breadcrumbs.sass
+++ b/src/sass/_theme_breadcrumbs.sass
@@ -1,34 +1,14 @@
-.wy-breadcrumbs
-  +clearfix
+.breadcrumb
+   padding-left: 0px
+   background-color: inherit
 
-.wy-breadcrumbs li
-  display: inline-block
-  &.wy-breadcrumbs-aside
-    float: right
-  a
-    display: inline-block
-    padding: 5px
-    &:first-child
-      padding-left: 0
-  code
-    padding: 5px
-    border: none
-    background: none
-    &.literal
-      color: $text-color
-.wy-breadcrumbs-extra
-  margin-bottom: 0
-  color: $text-light
-  font-size: 80%
-  display: inline-block
+.breadcrumb-aside
+   margin-left: auto
 
-
-+media($mobile)
-  .wy-breadcrumbs-extra
-    display: none
-  .wy-breadcrumbs li.wy-breadcrumbs-aside
+@include media-breakpoint-down(sm)
+  .breadcrumb li.breadcrumb-aside
     display: none
 
 @media print
-  .wy-breadcrumbs li.wy-breadcrumbs-aside
+  .breadcrumb li.breadcrumb-aside
     display: none
diff --git a/src/sass/_theme_layout.sass b/src/sass/_theme_layout.sass
index 0bf976d16..73bd28931 100644
--- a/src/sass/_theme_layout.sass
+++ b/src/sass/_theme_layout.sass
@@ -1,41 +1,41 @@
 // Set uniform (but not relative) base font size
-html
-  font-size: $base-font-size
+body
+  font-family: $font-family-base
+  font-size: $font-size-base
+
+h1, h2, h3, h4, h5, h6
+   font-family: $font-family-headings
+   font-weight: 700
+   margin-bottom: $line-height-base
+
+h1
+  font-size: 175%
+h2
+  font-size: 150%
+h3
+  font-size: 125%
+h4
+  font-size: 115%
+h5
+  font-size: 110%
+h6
+  font-size: 100%
 
-.wy-affix
-  position: fixed
-  top: $gutter
+ol, ul
+  padding-left: 0px
+
+.sidebar-navigation
+  width: $nav-desktop-width
 
-.wy-menu
   a:hover
     text-decoration: none
 
-.wy-menu-horiz
-  +clearfix
-  ul, li
-    display: inline-block
-  li:hover
-    background: rgba(255,255,255,.1)
-  li
-    &.divide-left
-      border-left: solid 1px hsl(0, 0%, 25%)
-    &.divide-right
-      border-right: solid 1px hsl(0, 0%, 25%)
-  a
-    height: $base-font-size * 2
-    display: inline-block
-    line-height: $base-font-size * 2
-    padding: 0 $base-font-size
-
-.wy-menu-vertical
-  width: $nav-desktop-width
-
   header, p.caption
     color: $nav-caption
-    height: $base-font-size * 2
-    line-height: $base-font-size * 2
+    height: $font-size-base * 2
+    line-height: $font-size-base * 2
     padding: 0 $gutter
-    margin: $base-line-height / 2 0 0 0
+    margin: $line-height-base / 2 0 0 0
     display: block
     font-weight: bold
     text-transform: uppercase
@@ -50,13 +50,13 @@ html
     &.divide-bottom
       border-bottom: solid 1px hsl(0, 0%, 25%)
     &.current
-      background: darken($menu-vertical-background-color, 10%)
+      background: darken($nav-menu-background-color, 10%)
       a
         color: $menu-link-medium
-        border-right: solid 1px darken($menu-vertical-background-color, 20%)
+        border-right: solid 1px darken($nav-menu-background-color, 20%)
         padding: $gutter / 4 $gutter * 1.5
         &:hover
-          background: darken($menu-vertical-background-color, 15%)
+          background: darken($nav-menu-background-color, 15%)
     code
       border: none
       background: inherit
@@ -79,12 +79,11 @@ html
     padding: $gutter / 4 $gutter
     font-weight: bold
     position: relative
-    background: $menu-vertical-background-color
+    background: $nav-menu-background-color
     border: none
     padding-left: $gutter -4px
-    +font-smooth
     &:hover
-      background: $menu-vertical-background-color
+      background: $nav-menu-background-color
       span.toctree-expand
         color: $menu-link-medium
     span.toctree-expand
@@ -95,8 +94,8 @@ html
       color: darken($menu-link-medium, 30%)
 
   li.toctree-l1.current > a
-    border-bottom: solid 1px darken($menu-vertical-background-color, 20%)
-    border-top: solid 1px darken($menu-vertical-background-color, 20%)
+    border-bottom: solid 1px darken($nav-menu-background-color, 20%)
+    border-top: solid 1px darken($nav-menu-background-color, 20%)
 
   // This is the on state for pages beyond second level
 
@@ -143,19 +142,19 @@ html
   li.toctree-l2
     &.current
       > a
-        background: darken($menu-vertical-background-color, 20%)
+        background: darken($nav-menu-background-color, 20%)
       li.toctree-l3 > a
-        background: darken($menu-vertical-background-color, 20%)
+        background: darken($nav-menu-background-color, 20%)
     span.toctree-expand
-      color: darken($menu-vertical-background-color, 35%)
+      color: darken($nav-menu-background-color, 35%)
   li.toctree-l3
     &.current
       > a
-        background: darken($menu-vertical-background-color, 25%)
+        background: darken($nav-menu-background-color, 25%)
       li.toctree-l4 > a
-        background: darken($menu-vertical-background-color, 25%)
+        background: darken($nav-menu-background-color, 25%)
     span.toctree-expand
-      color: darken($menu-vertical-background-color, 40%)
+      color: darken($nav-menu-background-color, 40%)
 
   li.current ul
     display: block
@@ -174,23 +173,23 @@ html
     font-size: 90%
     color: $menu-link-light
     &:hover
-      background-color: lighten($menu-background-color, 10%)
+      background-color: lighten($nav-background-color, 10%)
       cursor: pointer
       span.toctree-expand
         color: $menu-link-light
     &:active
-      background-color: $menu-logo-color
+      background-color: $nav-search-background-color
       cursor: pointer
       color: $menu-link-active
       span.toctree-expand
         color: $menu-link-active
 
-.wy-side-nav-search
+.sidebar-heading
   display: block
   width: $nav-desktop-width
   padding: $gutter / 2
   margin-bottom: $gutter / 2
-  z-index: $z-index-popover
+  z-index: $zindex-fixed
   background-color: $nav-search-background-color
   text-align: center
   color: $nav-search-color
@@ -204,17 +203,16 @@ html
     margin: auto auto $gutter / 2 auto
     height: 45px
     width: 45px
-    background-color: $menu-logo-color
+    background-color: $nav-search-background-color
     padding: 5px
     border-radius: 100%
-  > a, .wy-dropdown > a
+  > a
     color: $nav-search-color
     font-size: 100%
     font-weight: bold
     display: inline-block
-    padding: $base-line-height / 6 $base-line-height / 4
+    padding: $line-height-base / 6 $line-height-base / 4
     margin-bottom: $gutter / 2
-    +font-smooth
     &:hover
       background: rgba(255,255,255,.1)
     img.logo
@@ -234,15 +232,6 @@ html
     font-weight: normal
     color: rgba(255,255,255,.3)
 
-.wy-nav .wy-menu-vertical
-  header
-    color: $link-color
-  a
-    color: $text-light
-    &:hover
-      background-color: $link-color
-      color: $white
-
 [data-menu-wrap]
   +transition(all .2s ease-in)
   position: absolute
@@ -262,15 +251,10 @@ html
     left: auto
     opacity: 0
 
-.wy-body-for-nav
+.d-flex
   background: $section-background-color
 
-.wy-grid-for-nav
-  position: absolute
-  width: 100%
-  height: 100%
-
-.wy-nav-side
+.sidebar-right
   position: fixed
   top: 0
   bottom: 0
@@ -280,11 +264,11 @@ html
   overflow-x: hidden
   overflow-y: hidden
   min-height: 100%
-  color: $menu-medium
   background: $nav-background-color
-  z-index: $z-index-popover
+  z-index: $zindex-fixed
 
-.wy-side-scroll
+.sidebar-scroll
+  padding-bottom: $gutter / 2
   width: $nav-desktop-width + 20px
   position: relative
   overflow-x: hidden
@@ -300,16 +284,15 @@ html
   line-height: 50px
   text-align: center
   font-size: 100%
-  +clearfix
+  @include clearfix
   a
     color: $white
     font-weight: bold
-    +font-smooth
   img
-    margin-right: $base-line-height / 2
+    margin-right: $line-height-base / 2
     height: 45px
     width: 45px
-    background-color: $menu-logo-color
+    background-color: $nav-search-background-color
     padding: 5px
     border-radius: 100%
   i
@@ -318,72 +301,63 @@ html
     cursor: pointer
     padding-top: inherit
 
-.wy-nav-content-wrap
+.page-content-wrapper
   margin-left: $nav-desktop-width
-  background: $section-background-color
+  background: $content-background-color
   min-height: 100%
 
-.wy-nav-content
+.container-fluid
   padding: $gutter $gutter * 2
   height: 100%
   max-width: $nav-content-width
   margin: auto
 
-.wy-body-mask
-  position: fixed
-  width: 100%
-  height: 100%
-  background: rgba(0,0,0,.2)
-  display: none
-  z-index: $z-index-modal - 1
-  &.on
-    display: block
 footer
   color: $footer-color
   p
-    margin-bottom: $base-line-height / 2
+    margin-bottom: $line-height-base / 2
   span.commit code
     padding: 0px
-    font-family: $code-font-family
+    font-family: $font-family-code
     font-size: 1em
     background: none
     border: none
     color: $footer-color
 
 .rst-footer-buttons
+  @include clearfix
   &:before, &:after
     width: 100%
-  +clearfix
 
 .rst-breadcrumbs-buttons
+  @include clearfix
   margin-top: 12px
-  +clearfix
 
 #search-results
   .search li
-    margin-bottom: $base-line-height
+    margin-bottom: $line-height-base
     border-bottom: solid 1px $table_border_color
-    padding-bottom: $base-line-height
+    padding-bottom: $line-height-base
   .search li:first-child
     border-top: solid 1px $table_border_color
-    padding-top: $base-line-height
+    padding-top: $line-height-base
   .search li a
     font-size: 120%
-    margin-bottom: $base-line-height / 2
+    margin-bottom: $line-height-base / 2
     display: inline-block
   .context
     color: $text-medium
     font-size: 90%
 
 .genindextable li > ul
-  margin-left: $base-line-height
+  margin-left: $line-height-base
 
-+media($tablet)
-  .wy-body-for-nav
+@media (max-width: $nav-media-query)
+  .d-flex
     background: $section-background-color
   .wy-nav-top
     display: block
-  .wy-nav-side
+  .sidebar-right
     @if $nav-desktop-position == left
       left: -$nav-desktop-width
     @else
@@ -391,15 +365,15 @@ footer
     &.shift
       width: 85%
       left: 0
-  .wy-side-scroll
+  .sidebar-scroll
     width: auto
-  .wy-side-nav-search
+  .sidebar-heading
     width: auto
-  .wy-menu.wy-menu-vertical
+  .sidebar-navigation
     width: auto
-  .wy-nav-content-wrap
+  .page-content-wrapper
     margin-left: 0
-    .wy-nav-content
+    .container-fluid
       padding: $gutter
     &.shift
       position: fixed
@@ -410,14 +384,14 @@ footer
       overflow: hidden
 
 @media screen and (min-width: $nav-media-query)
-  .wy-nav-content-wrap
+  .page-content-wrapper
     background: rgba(0,0,0,.05)
-  .wy-nav-content
+  .container-fluid
     margin: 0
-    background: $section-background-color
+    background: $content-background-color
 
 @media print
-  .rst-versions, footer, .wy-nav-side
+  .rst-versions, footer, .sidebar-right
     display: none
-  .wy-nav-content-wrap
+  .page-content-wrapper
     margin-left: 0
diff --git a/src/sass/_theme_rst.sass b/src/sass/_theme_rst.sass
index b0cb0a703..3b43477b5 100644
--- a/src/sass/_theme_rst.sass
+++ b/src/sass/_theme_rst.sass
@@ -7,9 +7,8 @@
 //        * That said, know that I'm very unlikely to accept PRs from wyrm just to change style here.
 //    2. I plan to remove the !importants in here. Part of it is due to lazyness, part to sphinx's fondness for nesting.
 //    3. Try to use variables from wyrm_core/wy_variables.sass. Notable are...
-//        * $base-line-height // All margins, padding and line-height should use this in .25 increments.
+//        * $line-height-base // All margins, padding and line-height should use this in .25 increments.
 //        * $text-color, $text-light, $text-dark...etc
-//        * $base-font-family, $custom-font-family, $code-font-family
 //    4. If you have changes for mobile/tablet, put them at the bottom of the sass file.
 // --------------------------------------------------------------------------------------------------------------------
 
@@ -20,7 +19,7 @@
     height: auto
 
   div.figure
-    margin-bottom: $base-line-height
+    margin-bottom: $line-height-base
     p.caption
       font-style: italic
     p:last-child.caption
@@ -31,7 +30,7 @@
 
   // Usually it's a good idea to give images some space.
   .section > img,   .section > a > img
-    margin-bottom: $base-line-height
+    margin-bottom: $line-height-base
 
   // normalize browser styling
   abbr[title]
@@ -49,22 +48,24 @@
   // For the most part, its safe to assume that sphinx wants you to use a blockquote as an indent. It gets
   // used in many different ways, so don't assume you can apply some fancy style, just leave it be.
   blockquote
-    margin-left: $base-line-height
-    line-height: $base-line-height
-    margin-bottom: $base-line-height
+    @extend .blockquote
+    margin-left: $line-height-base
+    line-height: $line-height-base
+    margin-bottom: $line-height-base
+    font-size: $font-size-base
 
   pre.literal-block
     white-space: pre
     margin: 0
-    padding: $base-line-height / 2 $base-line-height / 2
-    font-family: $code-font-family
+    padding: $line-height-base / 2 $line-height-base / 2
+    font-family: $font-family-code
     display: block
     overflow: auto
   pre.literal-block, div[class^='highlight']
-    border: 1px solid $table-border-color
+    border: 1px solid $gray-300
     overflow-x: auto
     // 1px hack otherwise border won't show. lame
-    margin: 1px 0 $base-line-height 0
+    margin: 1px 0 $line-height-base 0
     div[class^='highlight']
       padding: 0px
       border: none
@@ -73,30 +74,33 @@
   div[class^='highlight'] td.code
     width: 100%
   .linenodiv pre
-    border-right: solid 1px lighten($table-border-color, 2%)
+    border-right: solid 1px $gray-300
     margin: 0
-    padding: $base-line-height / 2 $base-line-height / 2
-    font-family: $code-font-family
+    padding: $line-height-base / 2 $line-height-base / 2
+    font-family: $font-family-code
     user-select: none
     pointer-events: none
   div[class^='highlight'] pre
     white-space: pre
     margin: 0
-    padding: $base-line-height / 2 $base-line-height / 2
+    padding: $line-height-base / 2 $line-height-base / 2
     display: block
     overflow: auto
     & .hll
       // Line emphasis spans full width
       display: block
-      margin: 0 -1 * $base-line-height / 2
-      padding: 0 $base-line-height / 2
+      margin: 0 -1 * $line-height-base / 2
+      padding: 0 $line-height-base / 2
   pre.literal-block, div[class^='highlight'] pre, .linenodiv pre
-    font-family: $code-font-family
+    font-family: $font-family-code
     font-size: 12px
     line-height: 1.4
   
+  .literal-block-wrapper
+    padding: 0px 
+
   // Do not allow selection of code block prompts
-  div.highlight .gp 
+  div.highlight .gp
     user-select: none
     pointer-events: none
 
@@ -113,26 +117,27 @@
 
   // These are the various note pullouts that sphinx applies
   .note, .attention, .caution, .danger, .error, .hint, .important, .tip, .warning, .seealso, .admonition-todo, .admonition
-    @extend .wy-alert
+    @extend .alert
+    color: $text-color
     // These block elements are unsuitable for having floating objects next
     // to them
     clear: both
     .last, > *:last-child
       margin-bottom: 0
   .admonition-title
-    @extend .wy-alert-title
+    // @extend .alert-heading
     @extend .fa
     @extend .fa-exclamation-circle
     &:before
       margin-right: 4px
   .note, .seealso
-    @extend .wy-alert.wy-alert-info
+    @extend .alert-info
   .hint, .tip, .important
-    @extend .wy-alert.wy-alert-success
+    @extend .alert-success
   .error, .danger
-    @extend .wy-alert.wy-alert-danger
+    @extend .alert-danger
   .warning, .caution, .attention, .admonition-todo
-    @extend .wy-alert.wy-alert-warning
+    @extend .alert-warning
   // Some people put tables in notes. Let's give them very basic support.
   .admonition table
     border-color: rgba(0,0,0,.1)
@@ -140,27 +145,53 @@
       background: transparent !important
       border-color: rgba(0,0,0,.1) !important
   .section ul, .toctree-wrapper ul
-    @extend .wy-plain-list-disc
+     list-style: disc
+     line-height: $line-height-base
+     margin-bottom: $line-height-base
+     li
+       list-style: disc
+       margin-left: $line-height-base
+       p:last-child
+         margin-bottom: 0
+       ul
+         margin-bottom: 0
+       li
+         list-style: circle
+         li
+           list-style: square
+       ol li
+         list-style: decimal
   .section ol.loweralpha, .section ol.loweralpha > li
     list-style: lower-alpha
   .section ol.upperalpha, .section ol.upperalpha > li
     list-style: upper-alpha
   .section ol, ol.arabic
-    @extend .wy-plain-list-decimal
+     list-style: decimal
+     line-height: $line-height-base
+     margin-bottom: $line-height-base
+     li
+       list-style: decimal
+       margin-left: $line-height-base
+       p:last-child
+         margin-bottom: 0
+       ul
+         margin-bottom: 0
+         li
+           list-style: disc
   // Complex bullet lists, they have more item margins than simple lists
   .section ol li, .section ul li
     > *
-      margin-top: $base-line-height / 2
-      margin-bottom: $base-line-height / 2
+      margin-top: $line-height-base / 2
+      margin-bottom: $line-height-base / 2
       &:first-child
         margin-top: 0rem
     > p
       &, &:last-child
-        margin-bottom: $base-line-height / 2
+        margin-bottom: $line-height-base / 2
       &:only-child, &:only-child:last-child
         margin-bottom: 0rem
     > ul, > ol
-      margin-bottom: $base-line-height / 2
+      margin-bottom: $line-height-base / 2
   // Simple lists, no item margins
   .section ol.simple li, .section ul.simple li
     > *
@@ -171,24 +202,26 @@
       margin-bottom: 0rem
   .line-block
     margin-left: 0px
-    margin-bottom: $base-line-height
-    line-height: $base-line-height
+    margin-bottom: $line-height-base
+    line-height: $line-height-base
   .line-block .line-block
-    margin-left: $base-line-height
+    margin-left: $line-height-base
     margin-bottom: 0px
 
   // Generics handling of headings and toc stuff.
   .topic-title
     font-weight: bold
-    margin-bottom: $base-line-height / 2
+    margin-bottom: $line-height-base / 2
   .toc-backref
     color: $text-color
+    &:hover
+      text-decoration-line: none
   .align-right
     float: right
-    margin: 0px 0px $base-line-height $base-line-height
+    margin: 0px 0px $line-height-base $line-height-base
   .align-left
     float: left
-    margin: 0px $base-line-height $base-line-height 0px
+    margin: 0px $line-height-base $line-height-base 0px
   .align-center
     margin: auto
     // Do not override display:table for tables
@@ -215,33 +248,10 @@
   .centered
     text-align: center
 
-  // Sidebar content. You'll see at the bottom of this file I change it in mobile.
-  .sidebar
-    float: right
-    width: 40%
-    display: block
-    margin: 0 0 $base-line-height $base-line-height
-    padding: $base-line-height
-    background: $sidebar-background-color
-    border: solid 1px $sidebar-border-color
-    // Sidebar content is usually less relevant, so adjust the margins and sizes.
-    p, ul, dl
-      font-size: 90%
-    .last, > *:last-child
-      margin-bottom: 0
-    .sidebar-title
-      display: block
-      font-family: $custom-font-family
-      font-weight: bold
-      background: $table-border-color
-      padding: $base-line-height / 4 $base-line-height / 2
-      margin: -$base-line-height
-      margin-bottom: $base-line-height
-      font-size: 100%
   // Sphinx can highlight searched text with ?highlighted=searchterm
   .highlighted
     background: $highlight-color
-    box-shadow: 0 0 0 $base-line-height / 12 $highlight-color
+    box-shadow: 0 0 0 $line-height-base / 12 $highlight-color
     display: inline
     font-weight: bold
 
@@ -257,98 +267,81 @@
   .hlist
     width: 100%
 
-  // The html4 writer outputs the citation and footnotes as a table, and the
-  // html5 writer outputs these as a definition list. We will use the fairly
-  // well supported css `grid` attribute to make these back into a table
-  // HTML4 writer
-  html.writer-html4 &
-    table.docutils.citation, table.docutils.footnote
-      background: none
-      border: none
-      td, tr
-        border: none
-        background-color: transparent !important
-        white-space: normal
-      td.label
-        padding-left: 0
-        padding-right: 0
-        vertical-align: top
-  // HTML5 writer
-  html.writer-html5 &
-    dl dt span.classifier
-      &:before
-        content: " : "
-    dl.footnote,
-    dl.field-list
-      display: grid
-      grid-template-columns: max-content auto
-      > dt
-        padding-left: 1rem
+  // Formate citation and footnotes as a table.
+  // We will use the fairly well supported css `grid` attribute
+  dl dt span.classifier
+    &:before
+      content: " : "
+  dl.footnote,
+  dl.field-list
+    display: grid
+    grid-template-columns: max-content auto
+    > dt
+      padding-left: 1rem
+      &:after
+        content: ":"
+    > dt, > dd
+      margin-bottom: 0rem
+  dl.footnote
+    font-size: .9rem
+    > dt
+      margin: 0rem .5rem .5rem 0rem
+      line-height: 1.2rem
+      word-break: break-all
+      font-weight: normal
+      > span.brackets
+        margin-right: .5rem
+        &:before
+          content: "["
         &:after
-          content: ":"
-      > dt, > dd
-        margin-bottom: 0rem
-    dl.footnote
-      font-size: .9rem
-      > dt
-        margin: 0rem .5rem .5rem 0rem
-        line-height: 1.2rem
-        word-break: break-all
-        font-weight: normal
-        > span.brackets
-          margin-right: .5rem
-          &:before
-            content: "["
-          &:after
-            content: "]"
-        > span.fn-backref
-          font-style: italic
-      > dd
-        margin: 0rem 0rem .5rem 0rem
-        line-height: 1.2rem
-        p
-          font-size: .9rem
-    dl.option-list
-      kbd
+          content: "]"
+      > span.fn-backref
+        font-style: italic
+    > dd
+      margin: 0rem 0rem .5rem 0rem
+      line-height: 1.2rem
+      p
         font-size: .9rem
-  // Both
-  html.writer-html4 & table.docutils.citation, table.docutils.footnote,
-  html.writer-html5 & dl.footnote
+  dl.option-list
+    kbd
+      font-size: .9rem
+
+  table.docutils.footnote, dl.footnote
     color: $text-medium
     code
-      color: $gray
+      color: $gray-500
 
   // Remove the large vertical space between citations and footnotes
-  .wy-table-responsive.citation, .wy-table-responsive.footnote
+  .table-responsive.citation, .table-responsive.footnote
     margin-bottom: 0
   // Re-add vertical space to element directly following citation and footnotes,
   // if the following element is of a different type
-  .wy-table-responsive.citation + :not(.citation),
-  .wy-table-responsive.footnote + :not(.footnote)
-    margin-top: $base-line-height
+  .table-responsive.citation + :not(.citation),
+  .table-responsive.footnote + :not(.footnote)
+    margin-top: $line-height-base
   // Re-add vertical space after citation and footnotes if it is the last child of a parent
-  .wy-table-responsive.citation:last-child, .wy-table-responsive.footnote:last-child
-    margin-bottom: $base-line-height
+  .table-responsive.citation:last-child, .table-responsivefootnote:last-child
+    margin-bottom: $line-height-base
   table.docutils
-    @extend .wy-table
-    @extend .wy-table-bordered-all
+    @extend .table
+    @extend .table-bordered
     th
-      border-color: $table-border-color
+      border-color: $gray-300
       html.writer-html5 &
-        border: 1px solid $table-border-color
+        border: 1px solid $gray-300
     html.writer-html5 &
       th > p, td > p
         line-height: 1rem
         margin-bottom: 0rem
         font-size: .9rem
     &:not(.field-list)
-      @extend .wy-table-striped
+      @extend .table-striped
     // Remove bottom margin for the last element (and it's last child)
     td .last, td .last > *:last-child
       margin-bottom: 0
   // This table is what gets spit out for auto-generated API stuff. I style it smaller bits of padding.
   table.field-list
-    @extend .wy-table
+    @extend .table
     border: none
     td
       border: none
@@ -368,57 +361,57 @@
   tt, code
     @extend code
     color: $black
-    font-family: $code-font-family
+    font-family: $font-family-code
     padding: 2px 5px
     big, em
       font-size: 100% !important
       line-height: normal
 
     &.literal
-      color: $text-code-color
+      border: 1px solid $gray-300
+      color: $red
       white-space: normal
     &.xref, a &
       font-weight: bold
       color: $text-codexref-color
   pre, kbd, samp
-    font-family: $code-font-family
+    font-family: $font-family-code
   // If the literal is inside an a tag, let's color it like a link
   a tt, a code
     color: $link-color
   dl
-    margin-bottom: $base-line-height
+    margin-bottom: $line-height-base
     dt
       font-weight: bold
-      margin-bottom: $base-line-height / 2
+      margin-bottom: $line-height-base / 2
     // Most of the content within these dls are one liners, so I halve the normal margins.
     p, table, ul, ol
-      margin-bottom: $base-line-height / 2
+      margin-bottom: $line-height-base / 2
     // rST seems to want dds to be treated as the browser would, indented.
     dd
-      margin: 0  0 $base-line-height / 2 $base-line-height
-      line-height: $base-line-height
-  html.writer-html4 & dl:not(.docutils),
-  html.writer-html5 & dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.glossary):not(.simple)
-    margin-bottom: $base-line-height
+      margin: 0  0 $line-height-base / 2 $line-height-base
+      line-height: $line-height-base
+
+  dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.glossary):not(.simple)
+    margin-bottom: $line-height-base
     > dt
       display: table
-      margin: $base-line-height / 4 0
+      margin: $line-height-base / 4 0
       font-size: 90%
       line-height: normal
-      background: lighten($class-color, 50%)
+      background: lighten($class-color, 45%)
       color: $class-color
       border-top: solid 3px lighten($class-color, 20%)
-      padding: $base-line-height / 4
+      padding: $line-height-base / 4
       position: relative
       &:before
         color: lighten($class-color, 20%)
       .headerlink
         color: $text-color
         font-size: 100% !important
-    // In the html4 writer, parameters is a table. In html5 writer, parameters
-    // is a nested dl.field-list
+    // parameters
     dl:not(.field-list) > dt
-      margin-bottom: $base-line-height / 4
+      margin-bottom: $line-height-base / 4
       border: none
       border-left: solid 3px hsl(0,0%,80%)
       background: hsl(0,0%,94%)
@@ -426,6 +419,8 @@
       .headerlink
         color: $headerlink-color
         font-size: 100% !important
+      &:not(.sig-name)
+        color: darken($method-color, 35%)
     > dt:first-child
       margin-top: 0
     // Since dts get the callout style, we treat this less as callouts.
@@ -452,7 +447,7 @@
     display: inline-block
     color: $text-viewcode-color
     font-size: 80%
-    padding-left: $base-line-height
+    padding-left: $line-height-base
   .viewcode-back
     display: block
     float: right
@@ -477,18 +472,21 @@
         margin-right: 4px
   .guilabel
     border: 1px solid lighten($guilabel-color, 25%)
-    background: lighten($guilabel-color, 50%)
+    background: lighten($guilabel-color, 45%)
     font-size: 80%
     font-weight: 700
-    border-radius: $base-line-height / 6
-    padding: $base-line-height / 10 $base-line-height / 4
-    margin: auto $base-line-height / 12
+    border-radius: $line-height-base / 6
+    padding: $line-height-base / 10 $line-height-base / 4
+    margin: auto $line-height-base / 12
+  kbd, .kbd
+    color: inherit
+    background: $gray-300
   .versionmodified
     font-style: italic
 
 
 // Mobile specific
-+media($mobile)
+@include media-breakpoint-down(sm)
   .rst-content
     .sidebar
       width: 100%
diff --git a/src/sass/_theme_variables.sass b/src/sass/_theme_variables.sass
index d9a53107e..849df2c82 100644
--- a/src/sass/_theme_variables.sass
+++ b/src/sass/_theme_variables.sass
@@ -1,69 +1,67 @@
 // In here are varibles used for sphinx_rtd_theme, they either add to or overwrite the default ones
-// that are set in wyrm_core/wy_variables.sass. You'll find wyrm in bower_components if you're looking
-// for a reference.
-
+// -------------------------Paths-------------------------
 $fa-font-path:                        "~font-awesome/fonts"
-$static-img:                          "../img/"
 
+// -------------------------Layout-------------------------
+$gutter:                              1.618em // the golden ratio
+
+$nav-desktop-position:                left
+$nav-desktop-width:                   300px
 $nav-content-width:                   800px
 $nav-media-query:                     (($nav-desktop-width) + ($nav-content-width))
 
-$mathjax-color:                       $text-color
+// -------------------------Typography-------------------------
+$font-family-base:                    "Lato", "proxima-nova", "Helvetica Neue", Arial, sans-serif
+$font-family-headings:                "Roboto Slab", ff-tisa-web-pro, Georgia, Arial, sans-serif
+$font-family-code:                    SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", Courier, monospace
+$font-display:                        block
+$font-size-base:                      16px
+$line-height-base:                    24px
+
+// -------------------------Colors-------------------------
+// Text
+$text-color:                          hsl(0,0%,25%) !default
+$text-dark:                           lighten($text-color,15%) !default
+$text-medium:                         lighten($text-color,25%) !default
+$text-light:                          lighten($text-color,45%) !default
+$text-lighter:                        lighten($text-color,60%) !default
+
+// Content
+$section-background-color:            $gray-200
+$content-background-color:            $white
+$footer-color:                        $text-medium
 
+// Links
+$link-color:                          $blue
+$link-color-visited:                  $purple
 $headerlink-color:                    $text-color
 
+// Math
+$mathjax-color:                       $text-color
+
 // Code colors
 $text-viewcode-color:                 $green
 $text-codexref-color:                 $text-color
 
 // Definition list colors
 $class-color:                         $blue
-$method-color:                        $gray
+$method-color:                        $gray-500
 
 // GUI label color
 $guilabel-color:                      $blue
 
-// Footer colors
-$footer-color:                        $text-medium
-
-// Menu colors
-$menu-vertical-background-color:      $section-background-color
-
-// Menu text colors
-$menu-color:                          $gray
-$menu-dark:                           lighten($menu-color,10%) !default
-$menu-medium:                         lighten($menu-color,27.5%) !default
-$menu-light:                          lighten($menu-color,45%) !default
-$menu-lighter:                        lighten($menu-color,60%) !default
-
 // Menu link colors
 $menu-link-color:                     $text-color
-$menu-link-dark:                      $text-dark
 $menu-link-medium:                    $text-medium
 $menu-link-light:                     $text-lighter
 $menu-link-active:                    $white
 
 // Navigation colors
-$nav-background-color:                $menu-background-color
-$nav-search-background-color:         $blue
+$nav-background-color:                #343131
+$nav-search-background-color:         #2980B9
 $nav-search-color:                    $section-background-color
-$nav-link-color:                      $blue
-$nav-link-color-visited:              $purple
-$nav-link-color-hover:                lighten($nav-link-color, 6%) !default
-$nav-link-color-alt:                  hsl(33, 100%, 51%)
-$nav-caption:                         lighten($blue, 15%)
-
-// Sidebar colors
-$sidebar-background-color:            $table-stripe-color
-$sidebar-border-color:                $table-border-color
-$sidebar-title-background-color:      $table-border-color
+$nav-menu-background-color:           $section-background-color
+$nav-caption:                         $nav-search-background-color
 
 // Sphinx highlight color
 $highlight-color:                     $yellow
-
-$base-font-family:                    "Lato", "proxima-nova", "Helvetica Neue", Arial, sans-serif
-$custom-font-family:                  "Roboto Slab", "ff-tisa-web-pro", "Georgia", Arial, sans-serif
-$custom-font-family2:                 Georgia, serif
-$code-font-family:                    SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", Courier, monospace
-
-$font-display:                        block
diff --git a/src/sass/badge_only.sass b/src/sass/badge_only.sass
index 2b0941629..5a92e1c44 100644
--- a/src/sass/badge_only.sass
+++ b/src/sass/badge_only.sass
@@ -4,13 +4,10 @@
 // This generates the RTD sticky badge for non RTD themes. As
 // always, only files labeled "theme_*.sass should be edited".
 // ------------------------------------------------------------
-$border-box-sizing: false !default
 
-@import wyrm_core/wy_variables
+@import "node_modules/bootstrap/scss/functions"
+@import "node_modules/bootstrap/scss/variables"
+@import "node_modules/bootstrap/scss/mixins"
 @import theme_variables
-@import ~bourbon/app/assets/stylesheets/bourbon
-@import ~bourbon-neat/app/assets/stylesheets/neat
-@import wyrm_core/mixin
-@import wyrm_core/grid_settings
-@import _theme_badge_fa
-@import _theme_badge
+@import theme_badge_fa
+@import theme_badge
diff --git a/src/sass/theme.sass b/src/sass/theme.sass
index 73e77e4f6..52c74a29f 100644
--- a/src/sass/theme.sass
+++ b/src/sass/theme.sass
@@ -6,39 +6,14 @@
 // "theme_*.sass". All other files are loaded through bower.
 // ------------------------------------------------------------
 
-// Variable defaults set by Wyrm
-@import wyrm_core/wy_variables
+@import ~bootstrap/scss/bootstrap
 
 // Variable overrides that change coloring and fonts for this theme.
 @import theme_variables
 
-// bourbon.io framework
-@import ~bourbon/app/assets/stylesheets/bourbon
-
-// Bourbon.io/neat framework, with some default media queries
-@import wyrm_core/grid_settings
-@import ~bourbon-neat/app/assets/stylesheets/neat
-// Some corrections for neat
-@import wyrm_core/neat_extra
-
-// Custom reset
-@import wyrm_core/reset
-
-// Wyrm mixins
-@import wyrm_core/mixin
-
-// Font Awesome with wyrm extras
+// Font Awesome
 @import ~font-awesome/scss/font-awesome
-@import wyrm_core/font_icon_defaults
 
-// Wyrm core styles used in this theme
-@import wyrm_core/alert
-@import wyrm_core/button
-@import wyrm_core/dropdown
-@import wyrm_core/form
-@import wyrm_core/generic
-@import wyrm_core/table
-@import wyrm_core/type
 
 // Theme specific styles. These are likely the files you want to edit.
 @import theme_breadcrumbs
diff --git a/src/theme.js b/src/theme.js
index 2f0133428..39ff16b08 100644
--- a/src/theme.js
+++ b/src/theme.js
@@ -80,15 +80,15 @@ function ThemeNav () {
         $(document)
             // Shift nav in mobile when clicking the menu.
             .on('click', "[data-toggle='wy-nav-top']", function() {
-                $("[data-toggle='wy-nav-shift']").toggleClass("shift");
+                $("[data-toggle='sidebar-collapse']").toggleClass("shift");
                 $("[data-toggle='rst-versions']").toggleClass("shift");
             })
 
             // Nav menu link click operations
-            .on('click', ".wy-menu-vertical .current ul li a", function() {
+            .on('click', ".sidebar-navigation .current ul li a", function() {
                 var target = $(this);
                 // Close menu when you click a link.
-                $("[data-toggle='wy-nav-shift']").removeClass("shift");
+                $("[data-toggle='sidebar-collapse']").removeClass("shift");
                 $("[data-toggle='rst-versions']").toggleClass("shift");
                 // Handle dynamic display of l3 and l4 nav lists
                 self.toggleCurrent(target);
@@ -100,17 +100,17 @@ function ThemeNav () {
 
         // Make tables responsive
         $("table.docutils:not(.field-list,.footnote,.citation)")
-            .wrap("<div class='wy-table-responsive'></div>");
+            .wrap("<div class='table-responsive'></div>");
 
         // Add extra class to responsive tables that contain
         // footnotes or citations so that we can target them for styling
         $("table.docutils.footnote")
-            .wrap("<div class='wy-table-responsive footnote'></div>");
+            .wrap("<div class='table-responsive footnote'></div>");
         $("table.docutils.citation")
-            .wrap("<div class='wy-table-responsive citation'></div>");
+            .wrap("<div class='table-responsive citation'></div>");
 
         // Add expand links to all parents of nested ul
-        $('.wy-menu-vertical ul').not('.simple').siblings('a').each(function () {
+        $('.sidebar-navigation ul').not('.simple').siblings('a').each(function () {
             var link = $(this);
                 expand = $('<span class="toctree-expand"></span>');
             expand.on('click', function (ev) {
@@ -127,7 +127,7 @@ function ThemeNav () {
         var anchor = encodeURI(window.location.hash) || '#';
 
         try {
-            var vmenu = $('.wy-menu-vertical');
+            var vmenu = $('.sidebar-navigation');
             var link = vmenu.find('[href="' + anchor + '"]');
             if (link.length === 0) {
                 // this link was not found in the sidebar.
@@ -144,7 +144,7 @@ function ThemeNav () {
             // If we found a matching link then reset current and re-apply
             // otherwise retain the existing match
             if (link.length > 0) {
-                $('.wy-menu-vertical .current').removeClass('current');
+                $('.sidebar-navigation .current').removeClass('current');
                 link.addClass('current');
                 link.closest('li.toctree-l1').parent().addClass('current');
                 for (let i = 1; i <= 10; i++) {
diff --git a/webpack.common.js b/webpack.common.js
index 3ff0dce32..cd13b7787 100644
--- a/webpack.common.js
+++ b/webpack.common.js
@@ -37,10 +37,10 @@ module.exports = {
             loader: "sass-loader?indentedSyntax",
             options: {
               includePaths: [
+                "node_modules/bootstrap/scss",
                 "node_modules/bourbon/app/assets/stylesheets",
                 "node_modules/bourbon-neat/app/assets/stylesheets",
-                "node_modules/font-awesome/scss",
-                "node_modules/wyrm/sass"
+                "node_modules/font-awesome/scss"
               ]
             }
           }
@@ -66,11 +66,5 @@ module.exports = {
       filename: "css/[name].css?[hash]",
       chunkFilename: "css/[name].css?[hash]"
     }),
-    new CopyPlugin([
-      {
-        from: 'node_modules/html5shiv/dist/*.min.js',
-        flatten: true,
-        to: path.resolve(__dirname,'sphinx_rtd_theme/static/js') },
-    ]),
   ]
 };