Add highlighted lines to css rules.

static/css/lib/highlight.css

@@ -1,7 +1,8 @@
 td.linenos { background-color: #f0f0f0; padding-right: 10px; }
 span.lineno { background-color: #f0f0f0; padding: 0 5px 0 5px; }
-pre { line-height: 125%; }
-.hll { background-color: #49483e }
+pre { line-height: 125% }
+.highlighttable { background-color: #49483e; width: inherit; }
+.hll { background-color: rgba(255, 255, 0, 0.5); width: inherit; display: block; }
  { background: #272822; color: #f8f8f2 }
 .c { color: #75715e } /* Comment */
 .err { color: #960050; background-color: #1e0010 } /* Error */