Shoes.app :width => 640, :height => 480, :top => 100, :left => 100 do
  background(gradient(cornflowerblue, tomato))
  stack do
    flow do
      background(gradient(purple, orange))
      para "first"
      button("first", :top => 100, :left => 100){}
    end
    flow do
      background(gradient(gold, crimson))
      para "second"
      button("second", :top => 300, :left => 300) {}
    end
  end
  button("done", :top => 420, :left => 300) { exit }
end