This is just css file that changes the colors of apps that use the libadwaita style to the currently applied KDE Plasma color scheme.

Installation:

• copy gtk.css to the following directories:
  • ~/.config/gtk-3.0/
  • ~/.config/gtk-4.0/

Removal:

• delete gtk.css from the following directories:
  • ~/.config/gtk-3.0/
  • ~/.config/gtk-4.0/