Board Thread:Support Requests - Designing Your Wiki/@comment-33281220-20171008085630/@comment-9605025-20171008102217

I believe the first is a violation of the customization policy. As such, I would advise against it.

As for the second, the default font should already be a sans-serif type.

Also, do you understand the difference between Wikia.css and Common.css? Most new users don't and not a lot of "veteran" users take the time to explain. However, the difference does impact the potential viewing experience.