Board Thread:Support Requests - Getting Technical/@comment-1738746-20150916023112/@comment-17725354-20150916035559

The code for the usernames on that wiki is actually located at w:c:dragoncave:MediaWiki:Common.css/hilite.css, which has been imported to Common.css so that it affects both the default Oasis skin and the Monobook skin (assuming your wiki was created after July 2014, see the link below for more details). MediaWiki:Wikia.css (aka Special:CSS) only affects Oasis.

Here's the line in Common.css that imports Common.css/hilite.css: The text between  and the next   is the title of the page being imported.

See also: Help:Community_CSS_and_JS