What you have posted looks to be all things that you have added...

Some of it is functional but many are not affecting the display...

I would strip it all and start with this that is present in the stylesheet. Add your border & other styling items here.
Code:
.leftBoxContainer, .rightBoxContainer {
	margin-top: 1.5em;
	margin-bottom: 1.5em;
	}

.sideBoxContent {
	background-repeat:no-repeat;
	background-position:bottom;
	padding: 0.4em;
	}
If you do not have FireFox & the web dev tools please consider getting them as they prove to be invaluable and are as close to WYSIWYG for CSS.