TowerBuilder

from guizero import Box, App, PushButton, TextBox, Text, Slider

#main app
app = App()

#function
def refresh():
    box_header.width = sld_size.value
    box_header.height = sld_size.value
    box_body.width = box_header.width * 2
    box_body.height = box_header.height * 2
    box_footer.width = box_body.width * 2
    box_footer.height = box_body.height * 2
    box_four.width = box_footer.width * 2
    box_four.height = box_footer.height * 2
    app.height = 100 + box_header.height + box_body.height + box_footer.height + box_four.height

#widgets
lbl_size = Text(app, text="Choose a size for your tower (1-5):")
sld_size = Slider(app, start=1, end=50, width="fill", height=20)
btn_refresh = PushButton(app, text="refresh", command=refresh)

#three boxes
box_header = Box(app, align="top", border=0)
box_header.bg = "dark blue"

box_body = Box(app, align="top", border=0)
box_body.bg = "blue"

box_footer = Box(app, align="top", border=0)
box_footer.bg = "sky blue"

box_four = Box(app, align="top", border=0)
box_four.bg = "light blue"


app.display()