Make sure the templates have index.html and main_style.css. I'm sure index.html is there but you'll probably need to rename their css file to main_style.css. Once you do that though, you'll have to change its reference in the HTML file as well. So open the HTML file in some text editor and change this part:

Code:
 <link href="_____.css" rel="stylesheet" type="text/css"/>
to

Code:
 <link href="main_style.css" rel="stylesheet" type="text/css"/>