Button Raised Flutter. Falta mejorar

button_raised.dart

Widget _botonIngresar() {
    return Container(
      decoration: BoxDecoration(
        color: Color(0xFFa3137b),
        borderRadius: BorderRadius.all(Radius.circular(30)),
      ),
      width: double.infinity,
      child: Material(
        child: InkWell(
          onTap: () {
            print("tapped");
          },
          splashColor: Colors.white,
          child: Container(
            width: double.infinity,
            padding: EdgeInsets.symmetric(vertical: 15),
            alignment: Alignment.center,
            child: Text('Ingresar', style: TextStyle(color: Colors.white, fontWeight: FontWeight.w400, fontSize: 18),),
          ),
        ),
        color: Colors.transparent,
      ),
    );
  }