Thanks, CrouchingBruin. I finally figured that out and came back to post the solution. While I was at it, I also found a way to change the submenu background color, which was a little trickier, by changing this line:
#skenav ul .sub-menu li ,#skenav ul ul li { display: block; width:100%; }
to this:
#skenav ul .sub-menu li ,#skenav ul ul li { display: block; width:100%; background-color: #1f34c1 !important; }
It’s all good! Thanks again.