Hint if you're looking for other css selectors to make additional customizations: to inspect any GTK3 app under GNOME ≥ 3.14, just set the gsetting mentioned at

Hint if you're looking for other css selectors to make additional customizations: to inspect any GTK3 app under GNOME ≥ 3.14, just set the gsetting mentioned at [1], and Ctrl+Shift+I to get a Chrome/Firefox devtools-like inspector :) [1] https://wiki.gnome.org/Projects/GTK%2B/Inspector https://wiki.gnome.org/Projects/GTK%2B/Inspector