/* fixed-width centered container div */
div#wrapper {
	/* none of these styles are important for the functionality */
	width: 980px;
	padding: 10px;
	margin: 0 auto;
	border: 1px solid #c0c0c0;
}

/* styles for the affixed element */
#affix {
	/* 
	 * 'top' is the only important style in this block
	 * once this element becomes 'fixed' position, it will sit at the top 
	*/
	top: 0px;

	/* miscellaneous aesthetically-pleasing styles */
	width: 960px;
	padding: 10px;
	height: 100px;
	text-align: center;
	background-color: yellow;
	border: 1px solid #c0c0c0;
}