i'm using https://pub.dev/packages/rate_my_app but i can not change back btn fontSize or color. how can i do so?
final Widget cancelButton = RateMyAppNoButton(
_rateMyApp,
text: 'back',
callback: () => setState(() {}),
);
That's probably because the class RateMyAppNoButton doesn't allow much customising.
Try using standard Flutter buttons e.g.
final Widget cancelButton = RaisedButton(
onPressed: () {},
child: const Text('Cancel', style: TextStyle(fontSize: 20)),
);