solution2.dart

import 'package:flutter/material.dart';

void main() => runApp(
      MaterialApp(
        home: BallPage(),
      ),
    );

class BallPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.blue,
      appBar: AppBar(
        backgroundColor: Colors.blue.shade900,
        title: Text('Ask Me Anything'),
      ),
      body: Container(),
    );
  }
}

import 'package:flutter/material.dart';

void main() => runApp(
MaterialApp(
home: Ball_page(),
),
);

class Ball_page extends StatelessWidget {
const Ball_page({super.key});

@OverRide
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Colors.blue,
appBar: AppBar(
backgroundColor: Colors.blue[900],
title: Text(
'Ask me anything',
style: TextStyle(color: Colors.white),
),
),
),
);
}
}