It's gone now, so it looks normal again.

It was that way for a while, but it seems to have gotten better. Try again, and if it still looks bad, hold Shift and click on the Refresh button. If that doesn't work, follow this link to your preferences, go to the "Skin" tab, select any option other than "Slate" (I like the look of "Brick" for the wiki, but "Beach" doesn't look bad either), and uncheck "Let the admins override my skin preference." You should see the wiki in different colors and you will loose customized skins on other wikis, but at least you will be able to read this one!

Looks like any other wiki to me.