Board Thread:Support Requests - Getting Technical/@comment-44745594-20200518221050/@comment-4632631-20200519113417

You can't put the entirety of that block inside Wikia.css, only the CSS inside. The rest is HTML that isn't allowed onto wikis.

Anyway, that code contains an example within it that answers your question. The part inside  tags:

Except for the  tag, because that's not allowed either.

You'd need to wrap a file like  around   tags I think