Method for creating a triangle using CSS

triangle.css

#ribbon-back {
	border-color: transparent #660000 #660000 transparent; /* Triangle is created using two transparent sides for the border */
	border-width: 16px; border-style: solid;  /* Width is from the middle of the triangle */
	width: 0; /* Important that the Div has no width */
	height: 0; /* Important that the Div has no height */
	position: relative; 
	left: 704px; 
	top: -16px; 
	z-index: -1; /* Used for depth placement */
}