Move the embedded CSS (head section) to an external CSS file. Name the external CSS file masterstyles.css.
Use CSS3 to change the box-shadow to a desired value to get boxed shadows.
-moz-box-shadow: 10px 10px 5px #888;
-webkit-box-shadow: 10px 10px 5px #888;
box-shadow: 10px 10px 5px #888;