Board Thread:Support Requests - Designing Your Wiki/@comment-3048864-20201017025920/@comment-31208684-20201017032420

Just tested it out with PortableCSSPad and changing the font-size with !important should work. If it doesn't work bypass your cache/wait and try again.

But not sure if it would be the best idea, because changing the font size for the entire wiki can have some pretty wacky effects. Try keeping it to 14px at minimum.