Removed odd code block style

app/assets/stylesheets/blazer/github.css

@@ -5,9 +5,8 @@ github.com style (c) Vasily Polovnyov <vast@whiteants.net>
 */
 
 .hljs {
-  display: block; padding: 0.5em;
+  display: block;
   color: #333;
-  background: #f8f8f8
 }
 
 .hljs-comment,