CSS Styling and Prestashop Cart Modifications

Need work done to live PrestaShop cart site. Needs some visual work done in CSS and tables that are a bit out of whack, needs to become more of a professional standard. Need some sloppy code fixed up particularly in CSS. Need work done in the administration cart to set up custom SKU's. Basically need to be able to for example have a product that has variable options attached to it in a seamless manner. Like ordering a product off the Dell site for example. Knowledge of Prestashop will be a great advantage, if you don't know of the cart read up on it, it will be worth your while. High knowledge of CSS is a must.