using Gtk;

public class MyOverlay : Overlay {
    public MyOverlay (){
        var style = "
        .composited {
            background-color: rgba (0, 0, 0, 0.0);
        }
        ";
        var style_provider = new CssProvider ();
        try{
            style_provider.load_from_data (style, style.length);
        }catch (Error e){warning (e.message);}

        get_style_context().add_class("composited");
        get_style_context ().add_provider (style_provider, 600);
    }
}

public class Win : Window{

    public Win (){
        var overlay = new Grid ();

        var img = new Image.from_file ("/home/tom/Pictures/audience.png");

        var over = new Label ("<span fgcolor='#ffffff' font='60' weight='bold'>Hello world</span>");
        over.use_markup = true;
        over.valign = Align.END;

        overlay.attach (over, 0, 0, 1, 1);
        overlay.attach (img, 0, 0, 1, 1);

        this.add (overlay);
    }

}



public static void main (string [] args){
    Gtk.init (ref args);

    var w = new Win ();

    w.show_all ();

    Gtk.main ();
}