Container::default()
  .with_size(size!(100%, 50%))
  .with_align(Alignment::Center)
  .with_padding(5.)
  .with_gap(10.)
  .with_background(rect_frame! {
    color: (0.5, 0.5, 0.5, 1.),
    corner_radius: 10.,
  })
  .with_children(|ui| {
    Text::default()
      .with_text("Hello, world")
      .with_text_size(100)
      .with_color(color::BLACK)
      .add_child(ui);
    Container::default()
      .with_padding((10., 20.))
      .with_background(rect_frame! {
        color: color::DARK_RED,
        corner_radius: (2.5, 30., 2.5, 2.5),
      })
      .with_children(|ui| {
        Text::default()
          .with_text("Lorem ipsum dolor sit amet, consectetur adipiscing elit.")
          .with_text_size(24)
          .add_child(ui);
      })
      .add_child(ui);
  })
  .add_root(ui, size);