root = Card([header, options, actions])
header = CardHeader("Team Lunch Poll", "Friday, 12:00 PM")
options = RadioGroup("lunch", [opt1, opt2, opt3], "taco")
opt1 = RadioItem("Taco Truck", "Authentic street tacos", "taco")
opt2 = RadioItem("Sushi Bar", "Fresh rolls and bento boxes", "sushi")
opt3 = RadioItem("Pizza Place", "Wood-fired pies and salads", "pizza")
actions = Buttons([voteBtn])
voteBtn = Button("Vote", null, "primary")