http://jsfiddle.net/6HyjZ/
.bookmarkRibbon{ width:0; height:100px; border-right:50px solid blue; border-left:50px solid blue; bord
If you 'rotate' the css properties, it rotates the form by 90 degrees.
.bookmarkRibbon{ width:100px; height:0; border-bottom:50px solid blue; border-top:50px solid blue; border-left:30px solid transparent; }
http://jsfiddle.net/6HyjZ/6/