content: import 'package:device_preview/device_preview.dart';
  import 'package:flutter/cupertino.dart';
  import 'package:flutter/material.dart';
  
  void main() => runApp(
        DevicePreview(
          builder: (context) => MyApp(),
        ),
      );
  
  class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        locale: DevicePreview.of(context).locale,
        builder: DevicePreview.appBuilder,
        title: 'Flutter Demo',
        theme: ThemeData(
          brightness: Brightness.light,
        ),
        home: MyHomePage(),
      );
    }
  }
  
  class MyHomePage extends StatefulWidget {
    @override
    _MyHomePageState createState() => _MyHomePageState();
  }
  
  class _MyHomePageState extends State<MyHomePage> {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.green[600],
          title: Text('Flutter Tutorial 09'),
        ),
        body: Container(
          height: 200,
          color: Colors.lightGreen,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
              Text(
                'Row 01',
                style: TextStyle(fontSize: 20),
              ),
              Text(
                'Row 01',
                style: TextStyle(fontSize: 20),
              ),
              Column(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  Text(
                    'Column 01',
                    style: TextStyle(fontSize: 20),
                  ),
                  Text(
                    'Column 02',
                    style: TextStyle(fontSize: 20),
                  ),
                ],
              )
            ],
          ),
        ),
      );
    }
  }
  