Kivymd full app, graphic

import kivy

from kivymd.app import MDApp
from kivymd.uix.screen import Screen
from kivymd.uix.button import MDRaisedButton

class MyApp(MDApp):
    def build(self):
        screen = Screen()
        button = MDRaisedButton(
            text="Press me!",
            pos_hint={"center_x": 0.5, "center_y": 0.5},
        )
        screen.add_widget(button)
        return screen


if __name__ == "__main__":
    MyApp().run()