This repo contains different stylesheed edited to run with qbittorrent's style system
DarkStyleSheet is taken from https://github.com/ColinDuquesnoy/QDarkStyleSheet
Mumble Dark is taken from https://github.com/mumble-voip/mumble-theme
This repo also contains different tool to create your own qbittorrent theme files.
You can check the source of above style in Builds folder