import 'package:flutter/material.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: SizedBox(
            width: 100,
            height: 100,
            child: Material(
              color: Colors.blue,
              borderRadius: BorderRadius.circular(10.0)
            ),
          ),
        ),
      ),
    );
  }
}

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