ui.dart

@override
Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text('Flutter App'),
            centerTitle: true,
            elevation: 0,
        ),
        body: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
                Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                        Container(
                            child: Text('Some text'),
                        ),
                        Container(
                            child: RaisedButton(
                                onPressed: () {
                                    // Do something on press
                                },
                                child: Text('PRESS ME'),
                            ),
                        ),
                    ],
                ),
            ],
        ),
    );
}