Board Thread:Support Requests - Getting Technical/@comment-4723271-20170425211823/@comment-25390652-20170426124910

The issue is that @import works only when placed at the top of your css file. You can say that it is at the top, but MediaWiki:Common.css loads earlier, what makes a resulting file [here it is] put @import below. There are two solutions: I hope that helps.
 * 1) Move @import to the top of MediaWiki:Common.css page
 * 2) Remove @import and add the content of the page you try to import instead.