HN has an odd black bar on top of every page

Maybe it's just me, but now HN has an odd black bar on top of every page. I captured it and put it here for those who don't see it in case it is only me:

https://www.dropbox.com/s/6lz99lqplac75tt/hnblackbar.png.

Does anyone else have this? And if so then can anyone tell me why is it there because it certainly doesn't fit the design considering the logo padding has perhaps 2 pixels yet the border seems to be around 4 or 5 pixels. Then again HN never was known for awesome design, rather content, so from that point of view it might be design related. Or not. Either way, any insight?

Update: Gotcha! If an important person has wondered off, then the black bar shows up to show respect or so. Just never seen it before. Thanks guys!