Don't overlay the method's source over its docs in RDoc

assets/stylesheets/pages/_rdoc.scss

@@ -33,17 +33,8 @@
     }
   }
 
-  .method-description { position: relative; }
-
   .method-source-code {
     display: none;
-    position: absolute;
-    z-index: 1;
-    top: 0;
-    left: -1em;
-    right: 0;
-    background: var(--contentBackground);
-    box-shadow: 0 1em 1em 1em var(--contentBackground);
 
     > pre { margin: 0; }
   }

lib/docs/filters/rdoc/clean_html.rb

@@ -37,8 +37,10 @@ module Docs
         end
 
         # Add class to differentiate Ruby code from C code
-        css('.method-source-code > pre').each do |node|
+        css('.method-source-code').each do |node|
-          node['class'] = node.at_css('.ruby-keyword') ? 'ruby' : 'c'
+          node.parent.prepend_child(node)
+          pre = node.at_css('pre')
+          pre['class'] = pre.at_css('.ruby-keyword') ? 'ruby' : 'c'
         end
 
         # Remove code highlighting