Widget build(BuildContext context) {
    return SnackBarTheme(
      data: const SnackBarThemeData(
        width: 300,
        behavior: SnackBarBehavior.floating,
        actionTextColor: Color(0xFF0000FF),
      ),
      child: Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () {
              final snackBar = SnackBar(
                content: const Text('Yay! A SnackBar!'),
                action: SnackBarAction(label: 'Undo', onPressed: () {}),
              );
              ScaffoldMessenger.of(context).showSnackBar(snackBar);
            },
            child: const Text('Show snackbar'),
          ),
        ),
      ),
    );
  }