Put this into the server's .htaccess file (assuming that it's an Apache):
<IfModule mod_headers.c>
<FilesMatch "\.css$">
Header set Access-Control-Allow-Origin "*"
</FilesMatch>
</IfModule>
Put this into the server's .htaccess file (assuming that it's an Apache):
<IfModule mod_headers.c>
<FilesMatch "\.css$">
Header set Access-Control-Allow-Origin "*"
</FilesMatch>
</IfModule>