gnome-control-center complains about gtk.css
Created by: maxice8
(gnome-control-center:22590): Gtk-WARNING **: 19:11:23.202: Theme parsing error: gtk.css:6114:48: Missing closing bracket for :not()
(gnome-control-center:22590): Gtk-WARNING **: 19:11:23.202: Theme parsing error: gtk.css:6127:48: Missing closing bracket for :not()
(gnome-control-center:22590): Gtk-WARNING **: 19:11:23.202: Theme parsing error: gtk.css:6137:48: Missing closing bracket for :not()
(gnome-control-center:22590): Gtk-WARNING **: 19:11:23.202: Theme parsing error: gtk.css:6147:48: Missing closing bracket for :not()