weather_app_layout_01.dart

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text('My Weather App'),
    ),
    body: SafeArea(
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: <Widget>[
            Container(
              width: 300,
              height: 50,
              color: Colors.black,
            ),
            Container(
              width: 300,
              height: 50,
              color: Colors.red,
            ),
            Container(
              width: 300,
              height: 50,
              color: Colors.green,
            ),
            Container(
              width: 300,
              height: 50,
              color: Colors.blue,
            ),
          ],
        ),
      ),
    ),
  );
}