How can I center align elements on my cart page?

[sabricci]

I’m trying to center align some of the text and elements on my cart page. The first picture shows how the page looks currently and the second how I would like it to be with the product, quantity and total headers centered in their respective columns along with all the elements underneath them. I would also like the sub total and check out button centered underneath them. The third picture shows the mobile site as it currently is and the 4th how I would like it to be again with everything center aligned within their columns. The url is sabricci.com and the store password is latrau. Any help would be greatly appreciate, thanks!