Board Thread:Support Requests - Getting Technical/@comment-32094204-20180805053251/@comment-9605025-20180805105030

Are you talking about your personal CSS or site CSS?

If you are talking about personal CSS:

wikia.css is applied to the default Wikia desktop/laptop skin. Currently, the default desktop/laptop skin is Oasis. The default skin for mobile devices is Mercury; but Wikia does not provide a way to add custom CSS for mobile devices.

common.css is applied to all desktop/laptop skins. Prior to the EU's GDPR, Wikia additionally offered two older/more "traditional" skins. They were MonoBook and Uncyclopedia. However, per this announcement, both have been removed in order to comply with GDPR. As such, common.css is currently effectively the same as wikia.css

At some point in the recent past, Wikia changed how CSS is loaded. Prior to this change, all personal CSS (including global.css) was concatenated into a single stylesheet before being served to web browsers. As such, certain CSS would not work depending on where it was placed. As such, it would sometimes be necessary to, for example, import a font in your global CSS even if you wanted to use it for MonoBook only on a particular wiki.

If you are talking about site CSS:

The site CSS pages MediaWiki:Wikia.css and MediaWiki:Common.css are in a similar situation to the personal CSS pages. However, there is one difference. Despite the information being removed by Brandon Rhea, older wikis may still exhibit the older CSS application behavior. If this is the case for your wiki, then MediaWiki:Common.css is useless unless and until MonoBook is brought back.

Site CSS also used to be concatenated but, like personal CSS, isn't anymore.