Scaffold and AppBar with MaterialApp In Flutter

 import 'package:flutter/material.dart';

void main() {

  runApp(MaterialApp(

    title: 'FirstApp',

    home: Scaffold(

      appBar: AppBar(

        title: Text(

          'My First Flutter App',

          style: TextStyle(color: Colors.blue),

        ),

        backgroundColor: Colors.white,

      ),

      backgroundColor: Colors.green,

      body: Center(

        child: Text(

          'MaterialApp',

          textDirection: TextDirection.ltr,

          style: TextStyle(

              decoration: TextDecoration.none,

              color: Colors.white,

              fontSize: 20),

        ),

      ),

    ),

  ));

}