Flutter FlatButton is deprecated – alternative solution with width and height
I followed the guide here: https://flutter.dev/docs/release/breaking-changes/buttons. _buttonPreview(double _height, double _width) { final ButtonStyle flatButtonStyle = TextButton.styleFrom( minimumSize: Size(_width, _height), backgroundColor: Colors.grey, padding: EdgeInsets.all(0), ); return TextButton( style: flatButtonStyle, onPressed: () {}, child: Text( “some text”, style: TextStyle(color: Colors.white), ), ); }