If you have a cat on your keyboard or you were reaching for Ctrl+V to paste, you likely just hit this combo. Unlike the "Night Light" (which adds a warm amber glow), this flips the entire color spectrum.
If your screen suddenly looks like a photo negative, you likely activated a shortcut or accessibility filter. windows colors inverted
Seeing the Matrix: Why Your Windows Colors Just Inverted (And How to Fix/Use It) If you have a cat on your keyboard
Just hit Win + Ctrl + C and get back to work. windows colors inverted