Building Rounded corner boxes with shadows using CSS3:

With CSS3 now its easier to present the web content in more fascinating ways with less effort,the newer version includes a lot of new properties like border-radius ,text-shadow ,box-shadow,box-sizing and resizing ,word wrap and new attribute selectors etc.for more information you can visit www.w3c.org.
Here is a little example of rounded corner box with shadows :

CSS3 Rocks