anchor.diff:    @override
     Widget build(BuildContext context) {
       return MaterialApp(
  -      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
  +      theme: ThemeData.dark().copyWith(
  +        scaffoldBackgroundColor: darkBlue,
  +      ),
         debugShowCheckedModeBanner: false,
         home: Scaffold(
           body: Center(
  
positive.code: final String flutterCode = r'''
  import 'package:flutter/material.dart';
  
  final Color darkBlue = Color.fromARGB(255, 18, 32, 47);
  
  void main() {
    runApp(MyApp());
  
negative.code: class MyWidget extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Text(
        'Hello, World!',
        style: Theme.of(context).textTheme.headline4,
      );
    }
  }
  ''';
  