Before my current Chromebook, which allows fully turning off the display, I had a bookmark to a black image so that I could use my Chromebook at night for liste

Before my current Chromebook, which allows fully turning off the display, I had a bookmark to a black image so that I could use my Chromebook at night for listening to comedy, etc while falling asleep. Making a black image fullscreen would almost make it so that the display wasn't giving off light.