You're welcome. I totally understand how overwhelming things can be in the beginning. After all, I started out the same way.

Certainly, thanks for asking. I think this would blend everything together:

To change the green bottoms and grey box borders to match the red in the tops, find in that same "stylesheet.css" as before:
Code:
.centerBoxWrapper {
	border: 1px solid #9a9a9a;
	height: 1%;
	margin: 1.1em 0;
	}

.leftBoxHeading, .centerBoxHeading, .rightBoxHeading {
	margin: 0em;
	background-color: #9a9a9a;
	background-image: url(../images/tile_back.gif);
	padding: 0.5em 0.2em;
	}

.leftBoxContainer, .rightBoxContainer {
	margin: 0em;
	border: 1px solid #9a9a9a;
	border-bottom: 5px solid #336633;
	margin-top: 1.5em;
	}
Adjust the values(in red) to: ff1213, don't forget the "#" pound/number character or the semicolons at the ends.

I think that's a good start. If there's anything else, don't hesitate to ask.