change size of floating action button flutter code example

Example: floatingactionbutton flutter

Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: const Text('Floating Action Button'),
    ),
    body: Center(
      child: const Text('Press the button below!')
    ),
    floatingActionButton: FloatingActionButton(
      onPressed: () {
        // Add your onPressed code here!
      },
      child: Icon(Icons.navigation),
      backgroundColor: Colors.green,
    ),
  );
}