我如何让文本和CircleAvatar横跨在一起(相对的边)，就在应用程序栏的下面？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('My App'),
        ),
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Container(
              margin: EdgeInsets.only(top: 16),
              child: CircleAvatar(
                radius: 50,
                backgroundImage: AssetImage('assets/avatar.png'),
              ),
            ),
            Container(
              margin: EdgeInsets.symmetric(vertical: 16),
              child: Text(
                'Hello, World!',
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 24),
              ),
            ),
          ],
        ),
      ),
    );
  }
}