Card(
  child: Stack(
    children: <Widget>[
      Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Container(
            color: Colors.grey,
            height: 130,
          ),
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Text(product.name),
              Text(product.price.toString() + " yen"),
            ]),
        ],
      ),
      Positioned(
        right: 0.0,
        top: 110.0,
        child: RawMaterialButton(
          onPressed: () => model.addCartItem(product),
          shape: CircleBorder(),
          elevation: 2.0,
          fillColor: Colors.yellow,
          child: Icon(
            Icons.shopping_cart,
            size: 20,
          ),
        ))
    ],
  );