//flutter
import 'package:flutter/material.dart';

void main() {
  return runApp(TestPage());
}

//リスト4.41_cf
class TestPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Expanded',
      home: Scaffold(
        appBar: AppBar(title: Text('Expanded'), centerTitle: true,),
        body: Column(
          children: [
            Container(
              color: Colors.grey,
              height: 100,
            ),
            Expanded(
              child: Container(color: Colors.blue,)
            ),
            Container(
              color: Colors.grey,
              height: 100,
            ),
          ],
        )
      )
    );
  }
}