Vertical tab UI issues

[yylly]

The "+" icon for New Tab isn't adjusted when using dark mode:
 

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FIXED IN BETA:
The position of the "New Tab" button becomes misaligned when closing a tab (toggling "Expand tabs" puts it into the position it should be in)

[catsxp]

This should be a color matching issue
I considering whether to use distinct colors to distinguish them
In most cases, it is not necessary to fully display them

[yylly]

This should be a color matching issue
I considering whether to use distinct colors to distinguish them
In most cases, it is not necessary to fully display them

This wasn't a problem in builds from a few months ago, something changed.

Also, the alignment issue is separate from the color issue. The alignment issue also wasn't present in builds from a few months ago.

[yylly]

The new tab misalignment problem is fixed, but the "+" button is still dark and can't be seen without hovering the mouse cursor over it.