Odd, the background is dark for everyone else. I'm assuming that's a Wikia advert in the background that's causing this problem. Registering an account and turning off adverts should clear this up.
Hey there,
As explained by Gabriel Auditore already, this is likely caused by a background invasive advert. Registering on the site will relinquish these adverts, however should you not want an account, browsers such as Chrome and Firefox offer free add block add-ons which will hide these adverts in future.
I am a Wikia member, my preferences clearly say not to show ads, and I have AdBlock, but I'm still getting the same white background with gray text as the OP. Any ideas why that might be?
I'm also noticing the same thing, and I have ads turned off in my preferences as well. A look at the source reveals that the problem is not due to ads at all, but because the background color for the terminal blocks is #DDD, a very light grey. I'm going to change it to a much darker grey, though still lighter than the main background color.