root = Card([heading, radioGroup])
heading = Heading("Where should we go for lunch on Friday?", "h2")
restaurant1 = RadioItem("Pizza Palace", "Italian pizza", "pizza")
restaurant2 = RadioItem("Sushi Spot", "Fresh sushi", "sushi")
restaurant3 = RadioItem("Taco Town", "Mexican tacos", "taco")
radioGroup = RadioGroup("lunchPoll", [restaurant1, restaurant2, restaurant3], "pizza")