Captivate 8 - HTML 5 skin color not retaining

When I publish my project as HTML5 in Captivate 8, the skin color is different from what I set it as in the Skin Editor. In the skin editor my buttons are gray with white symbols and a yellow highlight. When I output as HTML5, the symbols become dark with a green highlight. How can I get it to retain what I set the skin to? Thanks!