Op zaterdag 30 juni 2018 02:17:55 CEST schreef DaveC49: > Geert, > > I tried this on Linux Mint 18.3 but had no changes from the default theme. > I think it will only work if the theme itself supports light and dark variants. Gtk's default theme, Adwaita, does. But I don't know about others. What is the default theme on Linux Mint ? Geert