How can I set black theme for k3b, I`m on Cinnamon and when I choose black theme it doesnt work for some app like k3b for instance
qt apps theming is not configurable with gtk-theming apps!
You will need to follow this:
sudo pacman -Syu qt5ct
su echo QT_QPA_PLATFORMTHEME=qt5ct >> /etc/environment
and use qt5ct to configure theme
Ok, thanx a lot for help :-)