Background colour, around the page

[m-dp]

The colour surrounding the page in night mode is not black, but dark green; on OLED displays, which have the benefit of a "real black" (lights are off), the area around the page is glowing.
It would be useful to be able to change that background colour, or to set it to black (since on OLED displays it means "off").

Thank you!

[foobnix]

You can find "Enhancements for OLED display" in the advanced book settings