Ask HN: Why was there a black border on HN few days back?
Marvin Minsky died. It was in his honor. You can see all of the stories on HN here -> https://hn.algolia.com/?query=Marvin%20Minsky&sort=byPopular...
When someone important to the community dies, a thin black bar is added to the top of HN as a mark of respect [1].
Thanks, wasn't aware of that.