flutter appear widget in case code example

Example 1: how to make reusable widget in flutter

Widget buildListContainer(BuildContext context,Widget list) {
    return Container(
      height: 300,
      child: ,
    );
  }

Example 2: stateless widget flutter

class GreenFrog extends StatelessWidget {
  const GreenFrog({ Key key }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(color: const Color(0xFF2DBD3A));
  }
}