Merge pull request #1220 from readthedocs/nienn/fix-sphinx-4-pre-overflow

Fix #1214: Sphinx 4 <pre> overflow

Author: agjohnson

sphinx_rtd_theme/static/css/theme.css

@@ -472,6 +472,7 @@
     .property
       display: inline-block
       padding-right: 8px
+      max-width: 100%
     // This is keywords such as "const"
     .k
       font-style: italic