[dev] updating doc to 2.0.0-beta.19

Author: serhiipylypchuk1991

package.json

@@ -13,8 +13,8 @@
     "normalizeLink": "cd plugins && node samplesLinksNormalize.js"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.16",
-    "@docusaurus/preset-classic": "^2.0.0-beta.16",
+    "@docusaurus/core": "^2.0.0-beta.19",
+    "@docusaurus/preset-classic": "^2.0.0-beta.19",
     "@mdx-js/react": "^1.5.8",
     "clsx": "^1.1.1",
     "docusaurus-gtm-plugin": "^0.0.2",

src/css/custom.css

@@ -168,6 +168,14 @@ code {
 
 /* end small code block */
 
+/* styles for block of code */
+
+.token-line.theme-code-block-highlighted-line{ /* added after updating to 2.0.0-beta.19 */
+    background-color: rgb(156 159 166 / 30%);
+  }
+  
+  /* end styles for block of code */
+
 /* list */
 
 .markdown ul  {