[eluser]Twisted1919[/eluser]
Jeeezzz.
Short , if you load the page and then you look into the source, you see your site url pointing to that css file . Copy that into your browser, and see if the css loads. If it does, then you have no problem. If it doesn't, it means you did a mistake when writing the path to the css file so correct it .
Other explanation, would be that, you somehow , using htaccess deny the access to the application folder (which i don't think u do)