Update docs/index.md

Author: XhmikosR

docs/index.md

@@ -124,12 +124,12 @@ For these first versions, functionality is limited and some concessions made:
 * CSS and JavaScript are all included in the same HTML file to reduce complexity.
 * We include the `frameborder` and `scrolling` attributes by default since we cannot know your setup, but you can optionally remove them and set them yourself via CSS:
 
-    {% highlight css %}
-    iframe {
-      overflow: hidden;
-      border: 0;
-    }
-    {% endhighlight %}
+{% highlight css %}
+iframe {
+  overflow: hidden;
+  border: 0;
+}
+{% endhighlight %}
 
 More refinement and functionality is planned with open-sourcing—any help is always appreciated!