It's advertising, it happens every now and again, but if wewe have AdBlock it will only be black no ads, but if wewe don't there should be an ad for something.
the image shows an ad from about 6mponths zamani (there have been zaidi though)
It's an advertisment for Lexus convertibles! You're probably seeing black because wewe have the ad blocker program, I don't. fanpop does full page advertisment some times, it's happened before. It will retreve to it's regular white backround in a couple days au so.