Theme Pack Overview
The styling of the E-Commerce pages are controlled by applying themes or skins in the admin panel and are meant to help maintain a separation between content and presentation. Above all else, this will ensure that future updates to the core pages are much easier.
The key to this kind of coding is to avoid using any inline styles and not to change the current markup in any way. When it is time to upgrade the core pages again in the future, any inline changes or customizations must be rolled over into the new pages and can incur additional time and cost.
Each theme pack contains a number of necessary files but the key files or folders that you need to work with in order to further develop your theme or extend the presentation are:
/App_Themes/YourThemeName/style-override.css
MasterPageYourThemeName.master
/scripts/customplugins/