Board Thread:Support Requests - Designing Your Wikia/@comment-24972932-20150929223407/@comment-168424-20151001000223

I believe most wikis only load MediaWiki:Wikia.css sitewide by default, so you'd have to request from staff to load MediaWiki:Common.css or import it in MediaWiki:Wikia.css.

Put this at the top of MediaWiki:Wikia.css:

@import "/load.php?mode=articles&only=styles&articles=MediaWiki:Common.css";