Board Thread:Support Requests - Getting Technical/@comment-1275903-20170602221457/@comment-26402117-20170603101910

That's really weird. So the CSS won't help, and you will probably get a response earliest Monday from staff about the bug.

If you ever did want to put CSS on your infoboxes, you'd use Common.css for all skins or Wikia.css for just Oasis (this one).