Problem styling Gtk::Box with CSS in gtkmm 3.10.1 - Stack Overflow
Gtk.Box – gtk+-3.0
xorg - GTK 3.22 migration of older gtk.css -> Black Margin on elementaryOS apps - elementary OS Stack Exchange
Gtk.ListBox - Classes - Gtk 3.0
Black borders around windows with GTK 3.16 · Issue #206 · numixproject/numix-gtk-theme · GitHub
I modified the gtk style by adding a gtk.css. Now the border is missing in nautilus & settings window but terminal has a border. What am i doing wrong? : r/linux4noobs
c - GTK Modifying Background Color of GtkButton - Stack Overflow