/* the overlayed element */
div.overlay{/* growing background image */
background-image:url(../images/white.png);/* dimensions after the growing animation finishes  */
width:640px;height:480px;/* initially overlay is hidden */
display:none;/* some padding to layout nested elements nicely  */
padding:35px}/* default close button positioned on upper right corner */
div.overlay div.close{background-image:url(../images/close.png);position:absolute;right:5px;top:5px;cursor:pointer;height:35px;width:35px}