Blah. I *had* read it, but never started poking into the code at all. My bad.
I was able to get it just the way I wanted, as well as add drop shadows.
.em-location-map {
border:2px solid gray;
box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.42);
-moz-box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.42);
-webkit-box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.42);
}