[Flutter]SnackBar

GestureDetector(
  onTap: () {
    const snackBar = SnackBar(content: Text('Tap'));

    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  },
  child: Container(
    padding: const EdgeInsets.all(10),
    decoration: BoxDecoration(
      color: Colors.red,
      borderRadius: BorderRadius.circular(5),
    ),
    child: const Text('Button'),
  ),
)