I've looked at the demo with Firebug
and tried to figure out a way to do what you are asking. Unfortunately, I am not a designer and only know enough CSS to make the minor adjustments necessary each month when I convert the Joomla releases to run on the WP version of the framework.
There is probably a way to adjust the transparency or opacity, but it's beyond my knowledge. Technically that is outside what support covers, but I'll pass your request to one of the designers and see if they have any suggestions.