It's quite good idea to have themes.
Because github (above) theme doesn't give correct view for dark theme in browser objects (if you select item you got black on dark blue background).
In this case you need to set white color
BrowserFontColor=16777215

But it doesn't help when you go from selected item into other window

But for grids you need to set colors in other place.
And it is not correct settings with you have empty cells and different colors for rows.
Ie all color scheme is located in different places, not easy to find ;(