FutureLearn GUIZero - Boxes

from guizero import App, Box, PushButton, Slider, ListBox
app = App()
box1 = Box(app, align="left", width=100, height=45, border=1)
box2 = Box(app, align="left", width=150, height=60, border=2)
box3 = Box(app, align="left", width=200, height=135, border=3)
button1 = PushButton(box1)
listb = ListBox(box2, height=50, width=50, items=["One", "Two", "Three"])
slider = Slider(box3, start=1, end=10)
app.display()