content: import 'package:device_preview/device_preview.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.dark,
          primarySwatch: Colors.orange,
        ),
        home: MyHomePage(),
      );
    }
  }
  
  class MyHomePage extends StatefulWidget {
    @override
    _MyHomePageState createState() => _MyHomePageState();
  }
  
  class _MyHomePageState extends State<MyHomePage> {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
          title: Text("Flutter Tutorial 08"),
        ),
        body: Container(
          width: double.infinity,
          height: 200,
          alignment: Alignment.center,
          color: Colors.orange,
          child: Text(
            'Container Widget!!',
            style: TextStyle(
              fontSize: 25.0,
            ),
          ),
        ),
      );
    }
  }
  