import 'package:flutter/material.dart'; class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter layout demo', home: Scaffold( appBar: AppBar( title: const Text('Flutter layout demo'), ), body: const Center( child: Text('Hello World'), ), ), ); } } void main() { runApp( MyApp() ); }