gtk-scale-overlap

from gi.repository import Gtk, Gdk

class ExampleWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="Example")

        self.set_default_size(150, 100)
        self.set_border_width(6)

        scale = Gtk.Scale(orientation=Gtk.Orientation.HORIZONTAL, adjustment=Gtk.Adjustment(0, 1,100, 1, 10, 0))
        scale.add_mark(100, Gtk.PositionType.BOTTOM, "100")
        scale.add_mark(99, Gtk.PositionType.BOTTOM, "99")

        self.add(scale)

win = ExampleWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()