Mimbo Pro is a premium theme and your have been doing some CSS editing. We regular Volunteers have zero experience with premium themes and those of us who remain don't provide CSS editing support. I'm thinking you may fare better by posting to the premium themes forum than you will here.
Read-access to the premium themes forum is now open to all users so you can search to see if your question has been previously asked and answered there. The premium theme forums are at http://premium-themes.forums.wordpress.com/ with separate sections for each theme. http://premium-themes.forums.wordpress.com/forum/mimbo-pro
If you are not successful when searching there is a link for the specific Premium Theme support forum for your theme under Appearance -> Themes in your blog’s Dashboard, but do note that the premium theme must be active and you must be signed in as the user who purchased it in order to see it and post to it.