pub fn build_scene_with_root<'a>(
children: &'a [ChildComponent],
viewport: (f32, f32),
root_css: CssStyle,
) -> BuiltScene<'a>pub fn build_scene_with_root<'a>(
children: &'a [ChildComponent],
viewport: (f32, f32),
root_css: CssStyle,
) -> BuiltScene<'a>