main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: Color(0xfff2f2f2)),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      height: 150,
      width: 70,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.all(Radius.circular(35.0)),
        color: Color(0xfff2f2f2),
        boxShadow: <BoxShadow>[
          BoxShadow(offset: Offset(4,4), color: Color(0xffcccccc), blurRadius: 5),
          BoxShadow(offset: Offset(-4,-4), color: Colors.white, blurRadius: 5),
        ]
      ),
    );
  }
}