fix styles

Author: Christopher Baker

prettify.less

@@ -1,6 +1,7 @@
 article {
     pre[class*="language-"] > code {
         font-size: 16px;
+        margin: 0;
         border-left: none;
         box-shadow: 0px 0px 0px 1px #dfdfdf;
         background-image: none;