Go inside. Click on "Backdrops". Right click, then click save image as, then save as Rainbow Background. ~enjoy~
Art made on the Krita drawing app. https://krita.org/en/ (this is all made by me, so don't accuse me of stealing it, please) ☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆ P.S. If you use this, you must put me in credits. Thanks! sCrAtCh oN! ©11/18/2021