Option to Darken UI While Keeping Document Background Unchanged

[HorseNuggets]

​Hey! I noticed that when using DocsAfterDark, both the surrounding interface and the document background go dark. This can be a bit tricky when I've set a specific background color for my document, as it ends up looking different than intended.​ Especially for collaboration, it would be neat to be able to ensure that the document itself appears consistent for everyone.

I tried using the "Default" option for "Document Background", but the page will just appear white, no matter what color I set it to.

I believe this feature would make DocsAfterDark even more versatile and user-friendly!