cmds.spawn((
    Node {
        width: px(200),
        height: px(200),
        flex_direction: FlexDirection::Column,
        align_items: AlignItems::Stretch,
        justify_items: JustifyItems::Stretch,
        align_content: AlignContent::Stretch,
        justify_content: JustifyContent::Stretch,
        ..default()
    },
    ThemeBackgroundColor(tokens::WINDOW_BG),
))
.with_child(color_plane(ColorPlane::HueLightness, ()));