Added fix comment about max-height of #application-header.
Added center-section class used to center buttons on index and mission pages.
Made helpers more robust. Will check if files exist before reading otherwise returning null.
Added a category with no products. Made products.php show a message if no products exist in a category.
Made category-links inherit color even if unvisited.
Created back-redirect reusable class with a tiny arrow on the left used in products.php. Moved a common style up in style.css.
Wordsmithing back redirect link text.