As an experimental effort, i don't see a reason why the author would change the style of the demo button in the post. The demo button here is an anchor tag with

As an experimental effort, i don't see a reason why the author would change the style of the demo button in the post. The demo button here is an anchor tag with a class name and he has used that style across the site for all demo/download buttons. Creating a separate demo page where all the html/css can be dumped looks like a better option rather than messing up with the php template.