如何在Flutter中对整个应用程序进行圆角操作？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        cardTheme: CardTheme(
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(10), // 设置圆角大小
          ),
        ),
      ),
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('圆角应用程序'),
      ),
      body: Center(
        child: Card(
          child: Padding(
            padding: EdgeInsets.all(20),
            child: Text(
              '这是一个圆角卡片',
              style: TextStyle(fontSize: 24),
            ),
          ),
        ),
      ),
    );
  }
}