threeboxes.py

from guizero import App, Box, ButtonGroup, PushButton, Text

app = App(title='Three Boxes', bg='silver', height=620, width=320)
box1 = Box(app, border=1, height=100, width=100)
box1.bg = 'red'
box2 = Box(app, border=2, height=200, width=200)
box2.bg = 'yellow'
box3 = Box(app, border=3, height=300, width=300)
box3.bg = 'green'

button1 = PushButton(box1, text="Button #1")
button1.bg = 'white'

button2 = PushButton(box2, text="Button #2")
button2.bg = 'white'

button3 = PushButton(box3, text="Button #3")
button3.bg = 'white'
lbl_choice = Text(box3, text='What does this look like?')
choice = ButtonGroup(box3, options=["fantastic", "boring", "mmmhhhh"], horizontal=True)

app.display()