How to get link in center of the footer with black background

Hi!
I have following problem:
In Branding, I made following link as global footer content :
Genius | Powered by The Art of Webdesign

On the site:
http://demo.theartofwebdesign.com/welcome-to-the-art-of-web-design/
here I need a black background
and:
http://demo.theartofwebdesign.com/
here at this blank page I need to hide the link entirely or if that is not possible, I need the text in center at the bottom.
Can this be made with html?
Or do you have a better solution?
Thanks for you help
Peter