It depends of screen size. If you put more articles on shopping cart module i can´t see the "comprar ahora" button and i can´t go to paid the articles. you have to put 8-10 articles on shopping cart and i can´t to see the button.
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1- Will activate the scrolling in case there are too many products in the cart.
2- Will avoid the weird listing. There will be 3 products in each row regardless of the height of the product.