Board Thread:Support Requests - Designing Your Wiki/@comment-28324698-20181201030045/@comment-9605025-20181205145515

Unfortunately, you cannot use anything that requires Bootstrap. The FANDOM Developers Wiki has the page Bootstrap which appears to be an attempt by Agent Zuri to make a modified version for Wikia. However, it looks like it isn't done. I have already tried to contact Agent Zuri about this (see here) since other users have asked about Bootstrap as well and this was his reply.

Since your tabs don't have a gradual change (ex. translation of the pointer), you should be able to get pretty close using what is already available and some CSS. I can't help right now but probably sometime this weekend at the latest.