With the 1.6 version of WPFolio I added a drop down menu bar. The default hover and background styles are shades of grey. The background colors in the navigation menu can be changed using your child theme the code snippet below.
WPFolio version 1.6 includes a sample child theme for adding your own modifications. These modifications stay separate from WPFolio so you can update and keep your tweaks.
The code below should help you get started. Add a color value after “background:” and before the semicolon. You can use hex values (or rgba if you care to be so bold).