astro_ray

https://github.com/vinceliuice/Orchis-theme Try this theme. It has some fix for libadwaita app. Although, your issue could be because of flatpaks. Any chance your flatpak apps are not getting themed?

There is a hacky way to turn the background pitch black using css. There used to be an app that I think could change the background. https://github.com/GradienceTeam/Gradience