I'm trying to align the video to the right of this page: http://www.clickbasics.com/make-a-difference/

I tried adding to my CSS file:
Code:
 #content-rightbox {
    display: block;
    float: right;
    width: 250px;
    height: 205px;
and the following HTML
HTML Code:
<div id="content-rightbox"><iframe width="250" height="205" src="http://www.youtube.com/embed/_ta50q9cKDQ?rel=0" frameborder="0" allowfullscreen></iframe></div>
It's not working. What am I missing?