How do you move the quota upgrade bar?

I am trying to move the Quota Upgrade link up so that it is centered in the space provided.

I have used the following CSS with no luck. What am I doing wrong?

#prosites-media-quota-display .media-upload {
float: right;
margin-top: -20px;

It works in Firebug, but when I save to the Custom CSS panel in my theme, nothing happens.

Thanks in advance for any advice!