Flutter: tough_bikes BikeButton with CustomPaint

main.dart

class BikeButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      height: 50.0,
      child: CustomPaint(
        painter: BikeButtonPainter(),
        child: Center(
          child: Text('Buy Tough Bike'.toUpperCase()),
        ),
      ),
    );
  }
}