Remove border around sidebox headers only

[Sketchy]

Hmmm... I think I know what you want.

In your current template stylesheet.css, you will find the sidebox borders;

.leftBoxContainer, .rightBoxContainer {
	margin: 0em;
	border: 1px solid #9a9a9a;
	border-bottom: 5px solid #336633;
	margin-top: 1.5em;
	}

You don't require them there, you would want the borders around the sidebox content only. Omit the lines in red from the above code. You will have nekkid sideboxes now.

In your current stylesheet, find right below the above code;

.sideBoxContent {
	background-color: #ffffff;
	padding: 0.4em;
	}

Replace above with;

.sideBoxContent {
	background-color: #ffffff;
        border: 1px solid #000000;
	padding: 0.4em;
	}

Adjust the added border declaration to your liking, to match with the image.

This will give you a pathway to your desired design, methinks.