无法在ListView flutter web中滚动

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('ListView Scroll Example'),
        ),
        body: SingleChildScrollView(
          child: ListView.builder(
            shrinkWrap: true,
            itemCount: 20,
            itemBuilder: (BuildContext context, int index) {
              return ListTile(
                title: Text('Item $index'),
              );
            },
          ),
        ),
      ),
    );
  }
}