Statefull Widget

Statefull.dart

class BlueCar extends StatefulWidget {
  const BlueCar({ Key key, @required child }) : super(key: key);  // Constructor

  @override
  _BlueCarState createState() => _BlueCarState();
}

class _BlueCarState extends State<BlueCar> {
  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xFFFFE306),
      child: Container(
             child: Container(
                    //child: Container()
                             )
                      )
     
    );
    
  }
}