Ask HN: What's up with the black table row at the top of HN now?

If you search for "black bar"[0] then you will see why it appears every now and again. Here's a link for this occasion:

https://news.ycombinator.com/item?id=14548030

[0] https://hn.algolia.com/?query=black%20bar&sort=byDate&prefix...