int main(string[] args) {
    Gtk.init(ref args);
    Gtk.Window wind = new Gtk.Window(Gtk.WindowType.TOPLEVEL);
    wind.title = "Some Window";

    Gtk.Label label = new Gtk.Label("White X-Mass");
    var lbl_css = """
            GtkLabel.plop {
                color: white;
                /*text-shadow:5 5 10 red;*/
            font-weight: bold;
            }
    """;
    var css = new Gtk.CssProvider ();
    try {
        bool loaded = css.load_from_data (lbl_css, lbl_css.length);
        stdout.printf("%s\n", (loaded ? "True" : "False"));
    } catch (Error e) {
        stderr.printf ("Error: %s\n", e.message);
    }
    wind.style.context.add_class ("plop");
    wind.style.context.add_provider (css, 600);
    stdout.printf("%s\n", css.to_string());

    wind.add(label);
    wind.show_all();
    stdout.printf("RUNNING \n");
    Gtk.main();
    return 0;
}