[Python] MDButton with kivymd not does not show the correct size when port to android

I made an application using KivyMD where when I run it on the computer it appears normally as shown in the image below:

https://ibb.co/mGpXHZc

But when port to android this happens:

https://ibb.co/vPM044k

How can solve that? follow ky code:

MDButton:
id: usbButton
size_hint: None, None
size: 115, 115
md_bg_color: 1, 1, 1, 1 # White background
pos_hint: {"center_x": .50, "center_y": .48}
on_release: root.manager.current = 'ScreenUSB'
MDButtonIcon:
icon: "usb"
color: "black"
font_size: "48dp"
pos_hint: {"center_x": .5, "center_y": .5}
MDButtonText:
text: "USB"
bold: "true"
color: "black"
font_size: "10dp"
pos_hint: {"center_x": .5, "center_y": .12}

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