Banner from Whole Page Indigo Where in CSS?

Hi I have built a RH Responsive HTML5 layout and done changes in the Layout.css for that with no problem. This is to augment things that are not editable in the RH application. But I have run into a frustrating problem. On pages that are told to be "open in new page" or "Whole Page", the banner at the top that has the project name header and the "Back" text on the right side, I can't find a way to change the banner color. Upon inspecting it in output it is relating to: <div class="topic-header" but I cannot find the CSS for this color change to be made?! Thanks for any help here!! Jeff