How do I change this color style?

Hello-

I am currently creating a Responsive HTML user guide for my company's software product and I cannot figure out how to change the default color of light blue displayed in the generated help to my company's colors.  Specifically, I wish to change the color of the title bar (#1 in the image) and the shadow of the selected topic (#2 in the image) to other colors.

I'm sure this should be an easy fix, but I cannot figure it out in spite of my efforts.

Can you help me, please?

I'm using RoboHelp 11.

Thank you-

Michael