from guizero import App, Box, PushButton
app = App()
box = Box(app, align="left", width="fill", border=2)
button = PushButton(box)
button1 = PushButton(box, text="another button")
app.display()

ERROR:

Traceback (most recent call last):
  File "c:\users\borto\mu_code\myapp.py", line 3, in <module>
    box = Box(app, align="left", width="fill", border=2)
TypeError: __init__() got an unexpected keyword argument 'width'
>>>