by explicitly including these in the selector removing the border, to avoid other rules on these pseudoclasses overriding the .flat class. https://bugzilla.gnome.org/show_bug.cgi?id=789733
by explicitly including these in the selector removing the border, to avoid other rules on these pseudoclasses overriding the .flat class. https://bugzilla.gnome.org/show_bug.cgi?id=789733