Ehmm why are you asking me? Anyway use Special:Block on the wiki you want him to block, you have to be an admin there of course. For serious vandalism you might want to contact VSTF team. This is the help page on blocking.
I haven't forgotten. Currently, there is a wiki bug that corrupts my restyle. I am now waiting for Wikia to fix that bug before telling others how to use it.
Finally got word back from sannse. The bug will not be fixed so my pure CSS solution is no more. The only way to do it now would be through JS. If still interested, I will try to work up an easy way to walk someone through it.
Too bad... CSS only was better! Anyway I'm still interested, I'll give a try! I little explanation is always appreciated, but if you show me a sample code I probably can figure it out myself.
I have it back up and running on Aion. It's not a pretty installation. You have to code each LI individually + add a bunch of CSS for it to work. You can look at the bottom of Aion's JS for the code. I'd have to go back and look to see what CSS is relevant, but I do remember it was quite a bit.