gtk_widget_modify_bg (window, GTK_STATE_NORMAL, &black);
g_signal_connect (G_OBJECT (window), "button-press-event", G_CALLBACK (on_window_clicked), NULL);
g_signal_connect (G_OBJECT (window), "key-press-event", G_CALLBACK (on_key_pressed), NULL);
gtk_widget_modify_bg (window, GTK_STATE_NORMAL, &black);
g_signal_connect (G_OBJECT (window), "button-press-event", G_CALLBACK (on_window_clicked), NULL);
g_signal_connect (G_OBJECT (window), "key-press-event", G_CALLBACK (on_key_pressed), NULL);