App bar

 import 'package:flutter/material.dart'; //dart language

void main(List<String> args) {

  runApp(MaterialApp(

    home: Scaffold(

      appBar: AppBar(

        title: Text("First App"),

        backgroundColor: Color.fromARGB(255, 31, 3, 82),

        centerTitle: true,

      ),

    ),

  ));

}