How do I set all Gmail web views to dark? (List view is good but mail content and settings are not) [closed]

Here are the screenshots:

I found that there are quite few options I can select in gmail web version.

What I expect:

I hope to let the view to follow OS's appearance. Light in day time and dark in night.

If it's not possible, I hope to make it always dark.

Thanks for any kind of tips.