buildItem.dart

Widget buildItem(int i) {
    return Container(
      width: MediaQuery.of(context).size.width,
      height: 100,
      decoration: BoxDecoration(
        color: Colors.deepOrangeAccent,
        border: Border.all(color: Colors.black, width: 1),
        boxShadow: [BoxShadow(blurRadius: 2)],
      ),
      child: FittedBox(
        child: Center(
          child: Text('$i'),
        ),
      ),
    );
  }