I have suggested these two features: Option for dark background in Presentation and Make an option for "Dark Document" in Document so that the page has a dark background for dark background. You can stop making these two features and make a new and better feature.
Add these two features:
a. Add suggested colors so that we can choose like dark, dark grey, dark blue, grey, brown, red, blue, purple etc.
b. And add custom color mode. I have named the video “custom color mode”. So, in the video we have an option to choose any background color we want. This could be made in OO mobile app.