Accessible Zen has some extra CSS styles built in that you can use to help customize your site. They are:
What it does: Helps replace text with an image.
What it does: Hide from both screen readers and browsers.
Screen Reader Text
What it does: Hide from browsers, but not screen readers.
What it does: Hide visually and from screenreaders, but maintain layout.
What it does: Create a unordered list or ordered list without bullets or numbers.
What it does: Create an horizontal list of navigation items, bested used on an unordered list.
What it does: Create a colored box around content to highlight it. Best used on paragraph or divs.
What it does: Contain floats.