let displayTotalPrice = document.createElement("span");
        cart.appendChild(displayTotalPrice);
        let totalPrice = 0;

        if(productData.hasOwnProperty("newPrice")) {
            productInfo.innerHTML = productData.name + " - " + productData.newPrice + "</br>";
            Number(totalPrice) += Number(productData.newPrice);
        }
        else {
            productInfo.innerHTML = productData.name + " - " + productData.price + "</br>";
            Number(totalPrice) += Number(productData.price);
        }

        displayTotalPrice.innerHTML = "Całkowita cena to: " + totalPrice;