Describe the new feature

Suggestion(s)
https://gyazo.com/103ffb4149f64ed32a85752787e0a03a

• There's some parts that are still white in the main interface.. they should probs be changed to match the theme.
• The window's bar up top is still white also.
• The dark theme should be customisable. e.g. I personally prefer shades of grey instead of blue.

https://gyazo.com/2b7ff61b98e0efbd56ee198551452fc1

• The "selected" tab color needs to be customisable.

Does this feature exist in another product or project? Please provide a link

No response

Do you have a screenshot? Please add screenshots to help explain your idea.

No response