If you need to this in a hurry ever get web-developer plugin for firefox
This allows you to see your webpage with each and every CSS tags name next to it.
If you can't find anything in the CSS file as i had to with soapbox for instance...
it showed me where the weird CSS called pub17 I then found in the index.php of the module...
yet that extension helpped loads bit heavy for a firefox though...as it has loads of function also like that..
So only use it when i need to find all CSS tags in a page displayed next to everything