“Buy” (“Order”) button next to each product
In a brick and mortar store, the customer simply takes the product and proceeds to make a purchase. In an online store, they indicate their decision to buy a product using the Buy button. If it is hard to find in the interface, a customer may decide not to make a purchase. To prevent this, the button should be highly visible and located next to the product description.
You should also make the order form as simple as possible.
Note
To analyze how the color of the Buy button affects the conversion rate for the “Go to cart” goal, use the Session parameters report in Yandex Metrica.