The original css is this:
background: none repeat scroll 0 0 #880000;
border-bottom: 1px solid #DDDDDD;
padding: 7px 0;
and it's in this file (along with many other things)
As you probably know, you could override any of those properties you want to change by putting them in your child theme's style.css.
background: none repeat scroll 0 0 #CCDDCC !important;
color: black !important;
With a little more finesse, you could also avoid using the brute-force !important statement. Maybe the author will come back and tell us of some built-in way to do that.