Vanilla 2

Do you have any advice for how I might attach the description to the bottom of the screen in a fixed location? I am using a CSS fixed div and populating it with the description (modified the plugin slightly), but when the screen is resized and the image holder is updated sometimes it will clip over my fixed div.

.pp_description
{
display: none;
z-index: 99999;
position: fixed;
left: 50%;
margin: 0 0 5px -400px;
text-align: center;
width: 800px;
padding: 5px;
height: 50px;
bottom: 0;
overflow-y: auto;
color: #fff;
background: #000;
}