I mention it in httpd.conf as follows to let you interpret css as php
<FilesMatch "\.css$">
ForceType application/x-httpd-php
</FilesMatch
Content-Type is output as text/html and is troubled. Therefore I added the next cord to the top of the css file.
<?php header("Content-Type: text/css"); ?>
It's not cool... Do you know how to output text/css ?