pos=((1026 - 200) / 2 + 100, 100))
self.start_button.bind(on_ref_press=self.app.start_game)
self.add_widget(self.stop_button)
pos=((1026 - 200) / 2 + 100, 100))
self.start_button.bind(on_ref_press=self.app.start_game)
self.add_widget(self.stop_button)