Iconbutton with shadow

Widget drawIcon(IconData icon, size) {
  return Material(
    color: Colors.lightBlue,
    shape: CircleBorder(),
    shadowColor: Colors.black,
    elevation: 20,
    child: Ink(
      width: size,
      height: size,
      decoration: const ShapeDecoration(
        color: Colors.white,
        shape: CircleBorder(),
      ),
      child: IconButton(
        padding: EdgeInsets.all(0),
        iconSize: 22,
        icon: Icon(icon),
        color: Colors.black,
        onPressed: onTap,
      ),
    ),
  );
}