import 'package:flutter/material.dart';

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

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Tooltip(message: 'this is codepan', child:Text(
          'Build some widgets!',
          style: Theme.of(context).textTheme.headline4,
        ),
                        ),
      ),
    );
  }
}