Board Thread:Support Requests - Getting Technical/@comment-1813349-20151204014527

Hi! One of my fellow admins on the PAW Patrol Wiki at paw-patrol.wikia.com tried to add some CSS to the Common.css page the other day (http://paw-patrol.wikia.com/wiki/MediaWiki:Common.css) but it doesn't appear to be working at all. He simply tried to add colour to the scrollbar and change the colours of links. I've copied the exact CSS to my test wiki at http://pablors-tests.wikia.com/wiki/MediaWiki:Common.css and even replicated the wiki's other CSS by copying its MediaWiki:Wikia.css, and everything seems to be fine. Any ideas on why this is not showing up, or how to fix it? 