Go to layout/colors, then put the HTML in your custom HTML header or footer (your choice), and the CSS in your custom CSS section.
Click to view, then click "back" to return.
<div class="amber"> <iframe frameborder="0" scrolling="no" class="amber" src="http://rb.lesigns.com/js.php?feature=amber1"></iframe> </div><!-- end amber alert -->Click to view, then click "back" to return.