issue with vertical tabs default dark theme

[Bdsrev]

Vertical tabs default dark theme needs to change because it's not dark enough and also, its colors aren't consistent with Edge's 'normal' horizontal tabs. Screenshots attached of current vertical tabs default dark theme vs what it should look like (if it was consistent with Edge's horizontal tabs dark theme). Please fix this! It really isn't dark enough :(

[#2]

Please, I'm not saying make it perfect black but at the moment, vertical tabs dark theme is more of a "gray theme" ! It's way too light, it's just not dark enough :( And this would be a fast and easy change to make! Please do this!