[Transparent App Bar] How to get a transparent app bar #flutter #dart

widget.dart

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        title: const Text('Hello !'),
      ),
      extendBodyBehindAppBar: true,
      body: Container(
        color: Colors.red,
        width: double.infinity,
        height: double.infinity,
      ),
    );
  }
}