from kivymd.app import MDApp
from kivymd.uix.label import MDLabel

class SimpleApp(MDApp):
    def build(self):
        label1 = MDLabel(
            text='Helló Világ',
            halign='center',
            theme_text_color='Custom',
            text_color=(0, 0, 1, 1)
        )
        return label1

SimpleApp().run()