User blog comment:Craiglpalmer/Wikia is now Fandom powered by Wikia/@comment-27791655-20161008071245/@comment-26437440-20161010052413

You can edit wikia as much as you want within your personal CSS/JS - remove ads, make the content space wider, remove the right rail, overhaul the global nav, etc...but any of that in your wiki-wide CSS or JS is a ToS violation.

If a staff member told you that you can't do that in your own personal CSS, I'd bring it up with another staff member.