Hello World in Flutter

HelloWorld.txt

import "package:flutter/material.dart";

void main() {
  runApp(MaterialApp(home: MyApp(), debugShowCheckedModeBanner: false));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      body: Container(
        alignment: Alignment.center,
        child: Text(
          "Hello World",
          style: TextStyle(
              color: Colors.red, fontSize: 30, fontWeight: FontWeight.bold),
        ),
      ),
    );
  }
}