I've had this CSS in a personal CSS file of my own for quite a bit and thought I'd add it wiki-wide because I figured it could be usable for other people to see if a category they've added might not be one that it's widely agreed should exist. Most categories (outside of a few image ones I can think of, IIRC, but that's my own fault if so) should have text on their category page, and a lot of former ones that shouldn't be used anymore have had their category page text deleted.
I hope you find it useful! (And if you see it and really don't like it for some reason, please feel free to tell me your reasoning for not wanting it around and I might remove it, depending on the reasoning.)
This is such a tiny wiki update but I thought it was important to let people know in case they saw it and didn't realize it was my doing.