Validating at http://d-theme.com/exquisite. The default style sheet language must be specified when style attributes are used and they are used twice. The best solution is to use a class.
<div style="clear: both;"></div>

CSS 3 validation produced the following errors.

URI : http://d-theme.com/sites/all/themes/exquisite/style.css?n
225 .artmenu ul li Parse Error *list-style-type: none;
226 * Parse Error *list-style-image: none;
227 * Parse Error }
347 .nav ul.artmenu ul span, .nav ul.artmenu ul span span Parse Error *padding: 0;
348 .nav ul.artmenu ul span, .nav ul.artmenu ul span span Parse Error }