Board Thread:Support Requests - Getting Technical/@comment-2026043-20121214164221/@comment-5209426-20121214184638

CzechOut wrote: ... This CSS resides in Common and then, yes, is manually imported into Wikia and Monobook. So if you want to share CSS between the two skins, you do need to manually import it.

... Correction to this, Common.css is automatically imported in Monobook but not Oasis. In Monobook, the site script controller takes Common.css and Monobook.css and mashes them together. This causes problems since  directives in Monobook.css don't work at all (  must be at the start of a CSS file, but ResourceLoader grabs Common.css then glues Monobook.css onto the end of it so any   in Monobook are actually in the middle of the two files which means they won't work).

Oasis' script controller only grabs Wikia.css without touching Common.css; as such,   does work properly in Wikia.css at the price of Common.css having to be imported manually.