Adding a Banner above header

I need to add a banner above the Windchill header for our Unclassified installation of Windchill.  Because the Windchill 10.2 header is so small, I can't add it to the image or it will be covered up any time we need to post an alert.  Here is an example of what I'm trying to do.  I can find the style for the image, but not for the entire page.

Any ideas where I might find the correct style of entry to accomplish this task?

Thanks.