Board Thread:Support Requests - Getting Technical/@comment-26097716-20150918034213/@comment-2170536-20150918035403

This is definitely the right place.

In order to do that currently, you will need access to the MediaWiki namespace, which requires administrator access on the wiki in question. If you do have that access, you can add your selectors to MediaWiki:Wikia.css for the Oasis skin.

For regular users, only inline styles are currently available if you want to have them work for all viewers of the page.