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Home / CSS3 Previews / Box-shadow, one of CSS3′s best new features The box-shadow property allows designers to easily implement multiple drop shadows (outer or inner) on box elements, specifying values for color, size, blur and offset. Browser support is growing of late with Mozilla (Firefox), Webkit (Safari/Chrome/Konqueror), Opera and the IE9 Platform Preview all offering a decent implementation of the spec, although Mozilla and Webkit still require their respective -moz- and -webkit- prefixes (note Mozilla Firefox 4.0+ no longer requires the -moz- prefix). Here’s a basic example: Firefox, Safari/Chrome, Opera and IE9 users should see a grey fading shadow under this box.
What's the big deal? These overlays use a number of new CSS properties, some of which are simple like border-radius and using RGBa colors. The trick with these overlays is the gradient border, going form a lighter to darker orange as you go from top to bottom.