editing window background for individual application

I want to be able to change the background in ubuntu (in settings, for windows I can choose light, normal, or dark). I use dark, as I prefer an environment easier on my eyes. However, I want to have a gray windows environment in libreoffice, rather than the dark background. please change wayland so the user can allow an individual application to override the window settings, or add the additional feature into libreoffice. I want libreoffice to look like microsoft word (rather than a turd, how libreoffice currently look). That means I want the text rectangle to be white, and the background and tabs to be a light gray.