[Python] How to alignment element of page.overlay[] list?

I have an flet.Container() object, that appending to page.overlay. Then I want to show it, by page.update(). But it align by default: start, start(top-left corner). It should align bottom-center as I want.

I was trying align elements on page by

page.vertical_alignment = 'start'
page.horizontal_alignment = 'center'


no results, cuz I writing questions rn.

P.S. I bet 100%, there is no people who need it, or gonna check this question, but I leave my full code here:

import flet as ft

def main(page : ft.Page):
def keyboard():
vk = ft.Container(
content=ft.Column(
controls=[
ft.Row([ft.OutlinedButton('O', width=120, height=70) for i in range(12)], spacing=25),
ft.Row([ft.OutlinedButton('O', width=120, height=70) for i in range(12)], spacing=25),
ft.Row([ft.OutlinedButton('O', width=120, height=70) for i in range(12)], spacing=25),
ft.Row([ft.OutlinedButton('O', width=120, height=70) for i in range(12)], spacing=25),
],
expand=True,
spacing=25,
),
bgcolor='teal.5',
width=page.window.width,
border=ft.border.all(4, 'teal'),
border_radius=ft.border_radius.all(5),
alignment=ft.alignment.bottom_center
)
return vk


page.window.full_screen = True
page.vertical_alignment = 'start'
page.horizontal_alignment = 'center'
page.padding = 0
page.theme = ft.Theme(color_scheme_seed=ft.Colors.GREEN)




def onbl(e):
page.overlay.pop(0)
page.update()

def oncl(e):
kb = keyboard()
page.overlay.append(kb)
page.update()


tf = ft.TextField(
label='Тыкни',
on_focus=oncl,
on_blur=onbl,
)

page.add( ft.VerticalDivider(), tf)


ft.app(main)

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