Revert "Change layout to fix missing scrollbar highlighting (chromium)"

See #640.

This reverts commit 3ababaf.

Author: cynecx

templates/style.scss

@@ -84,6 +84,15 @@ div.rustdoc {
             }
         }
     }
+
+    // this is actual fix for docs.rs navigation and rustdoc sidebar
+    position: fixed;
+    top: $top-navbar-height;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    display: block;
+    overflow-y: auto;
 }
 
 body {
@@ -802,16 +811,3 @@ i.dependencies.normal {
   visibility: hidden;
   display: none;
 }
-
-// Fix position of theme-picker
-.theme-picker {
-    margin-top: $top-navbar-height;
-}
-
-// Fix for anchors, so that they are well positioned right below the sticky header
-.section-header::before {
-    display: block;
-    content: "";
-    height: 3rem;
-    margin-top: -3rem;
-}