CSS Framework: Updated section about shadow

Closes gh-245

pages/theming/css-framework.html

@@ -114,6 +114,6 @@ <h4>Overlay &amp; Shadow</h4>
 		<code>.ui-widget-overlay</code>: Applies 100% width &amp; height dimensions to an overlay screen, along with background color/texture, and screen opacity.
 	</li>
 	<li>
-		<code>.ui-widget-shadow</code>: Class to be applied to overlay widget shadow elements. Applies background color/texture, custom corner radius, opacity, top/left offsets and shadow "thickness". Thickness is applied via padding to all sides of a shadow that is set to match the dimensions of the overlay element. Offsets are applied via top and left margins (can be positive or negative).
+		<code>.ui-widget-shadow</code>: Class to be applied to overlay widget shadow elements. Sets <code>box-shadow</code> x &amp; y offset, blur radius and color.
 	</li>
 </ul>