import flet as ft


def main(page: ft.Page):
    page.window.width = 400
    page.window.height = 400
    page.vertical_alignment = ft.MainAxisAlignment.CENTER
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER

    page.add(
        ft.TextButton(
            content='test_button_0',
            style=ft.ButtonStyle(
                bgcolor=ft.Colors.WHITE,
                color=ft.Colors.BLACK,
                shape=ft.RoundedRectangleBorder(0),
            )
        )
    )


if __name__ == '__main__':
    ft.run(main)