Merge pull request #9015 from adamscott/fix-website-highlight

Fix website highlight of text

(cherry picked from commit ac92bfb47aa7789c87d640522fedfbf9cde0e95c)

_static/css/custom.css

@@ -668,6 +668,7 @@ footer {
 }
 
 .wy-body-for-nav {
+    position: relative;
     background-color: var(--content-wrap-background-color);
 }