Yes, I know, I already get used to my own skin (based on one other theme, some random graphics + logo of my faction)

My notebook doesn't like dark colors, and default white is so white, so.. For me it is something what doesn't hurt my eyes and still it doesn't break my notebook screen.
Btw, qss is such easy as css, wonder why almost noone is making skins for mumble

Btw, as I remember, to get everything working correctly (some buttons, or something else doesn't load instantly) you have to restart your mumble client.