GTK+ 3.21 is stricter about CSS values having a unit defined. Fix the gnome-calendar CSS accordingly. https://bugzilla.gnome.org/show_bug.cgi?id=765698
GTK+ 3.21 is stricter about CSS values having a unit defined. Fix the gnome-calendar CSS accordingly. https://bugzilla.gnome.org/show_bug.cgi?id=765698