import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: MyWidget(),
    ),
  );
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(
        child: ExpansionTile(
          title: Text('あなたできるクロスプラートフォーム言語はなんでしょう？'),
          children: [
            ListTile(
              title: Text('C++'),
            ),
            ListTile(
              title: Text('JS/TS'),
            ),
            ListTile(
              title: Text('Dart'),
            ),
          ],
        ),
      ),
    );
  }
}