Board Thread:General Discussion/@comment-5377726-20171105050923/@comment-5454372-20171105212553

Andrewds1021 wrote: That is because CSS/JS pages are case sensitive. Site-wide CSS such as MediaWiki:Common.css are capitalized while personal CSS such as User:Andrewds1021/common.css are not.

Hmm, then it looks like the issue isn't case sensitivity in the pagename, since Happyboy88 posted the CSS to MediaWiki:Common.css -- yet the scrollbar code from that page doesn't seem to be working. Copying the exact same code into my own personal CSS changed the scrollbar's appearance, both on the CommunityTest wiki and the Barbie wiki itself.

A quick look through Barbie wiki's MediaWiki:Wikia.css page isn't showing any  or references to   selectors, so it doesn't appear to be a case of conflicting code (if it was, then my own personal CSS on the same wiki shouldn't have worked either). I'm honestly a bit stumped why the code isn't working in the wiki-wide pages, yet works as intended as personal CSS.

This might be time for a bug report, unless I'm overlooking something... 

Thanks for that reference site as well, that'll come in handy when fiddling with fancier selectors.