GTK is nice but too thick. There is a repo containing CSS for GTK3 to be more compact.
I could not find the same for GTK4.
Gradience from Flathub allows to load custom CSS. The GTK3 one did not change anything.
I use Fedora Kinoite (KDE) and all GTK apps are Flatpaks.
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2 points
Gradience mainly changes the looks of libadwaita applications and it only work on gtk3 and gtk4 apps if you use the adw-gtk3 theme.
There is an important difference between gtk4 and libadwaita. While libadwaita apps use gtk4 in the background, they cannot be themed through normal gtk theming.
I don’t know of any way to change the compactness of gtk4 or libadwaita, sorry.
1 point
