Kivymd Prosty przycisk
btn = MDFillRoundFlatButton(text='Halo bro',
pos_hint={'center_x': 0.5, 'center_y':0.5})
Grumpy Grasshopper
btn = MDFillRoundFlatButton(text='Halo bro',
pos_hint={'center_x': 0.5, 'center_y':0.5})