I don't know if this is a glitch or something, and if it's not i'd like to know how to re-enact it, but basically I had the big black on my beat map selection then pressed escape to return to the osu! home screen,I pressed the stop music button and left osu! on for a while with google chrome open and when I came back to click the circles to the beat I saw the big black as the background instead of one of the various pieces of amazing new art that's supposed to be the homescreen. Here's a link to the screenshot https://ibb.co/jPgGDU.