Mobile Version Cart

On the mobile version of the site, when I add something to the cart, the cart page cuts out the whole fifth column of the cart (the ‘Total’ column), leaving a portion of the right hand side of the pack blacked out compared to the cart with the white background, the ‘apply coupon’ button is also sticking half out of the white cart space and half into the blank black portion on the right hand side of the page. This problem doesn’t occur on the website when you access it via computer or laptop, just mobile as far as I know. When the cart is empty there is not this ‘split’ down the page, only when there’s products in the cart. Is there any way around this?

http://www.oceandesignerwear.com/shop/