Board Thread:Support Requests - Designing Your Wiki/@comment-3147293-20161109073712/@comment-30683785-20161111053301

As far as I know, MediaWiki:Mainpage.css is just another one of your every day CSS pages, and is simply imported via an importStylesheet statement through MediaWiki:Common.css. Our wiki does a similar thing, importing through Common.js instead of .css, though it should be fairly simple to do either.