<footer class='card-footer'>
  //
  <form action='/cart/products/${product.id}' method='POST'>
    <button class='button has-icon is-inverted'>
      <i class='fa fa-shopping-cart'></i> Add to cart
    </button>
  </form>
</footer>

<footer class='card-footer'>
  <form action='/cart/products' method='POST'>
    <input hidden value='${product.id}' name='productId' />
    <button class='button has-icon is-inverted'>
      <i class='fa fa-shopping-cart'></i> Add to cart
    </button>
  </form>
</footer>