Rounded Button with FlatButton & RaisedButton in flutter

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Button"),
        elevation: 0,
      ),
      body: Container(
        decoration: BoxDecoration(
            gradient: LinearGradient(
                colors: [Colors.blue, Colors.blueGrey],
                begin: Alignment.topCenter,
                end: Alignment.bottomCenter)),
        child: Center(
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              FlatButton(
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(15),
                      side: BorderSide(color: Colors.white)),
                  color: Colors.green,
                  onPressed: () {
                    print("YES terpilih");
                  },
                  textColor: Colors.white,
                  child: Text("YES")),
              SizedBox(
                width: 10,
              ),
              RaisedButton(
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(15),
                      side: BorderSide(color: Colors.white)),
                  color: Colors.red,
                  textColor: Colors.white,
                  onPressed: () {
                    print("NO terpilih");
                  },
                  child: Text("NO"))
            ],
          ),
        ),
      ),
    );
  }
}