Board Thread:Support Requests - Designing Your Wiki/@comment-25108695-20181229010238/@comment-9605025-20181231182944

When I said you only need one, I also meant that you only need it in one of the stylsheets; I think. It is probably okay to leave it on both but, if you do remove one of them, remove it from Wikia.css.

As for why you aren't seeing any changes, that is because you haven't applied the font to anything. The @font-face simply makes the font available. You need to apply the custom font in the same manner you would a standard font.