This can be used in casting shadows off block-level elements like divs, tables etc. (still not supported in IE7 and IE8). Parameters (from left to right): horizontal offset of the shadow, vertical offset of the shadow, blur radius (optional), spread radiu

gistfile1.css

    <style type="text/css">
/* Source: http://www.apphp.com/index.php?snippet=css-box-shadow */
    .shadow {
        -moz-box-shadow: 4px 5px 5px 1px #777;
        -webkit-box-shadow: 4px 5px 5px 1px #777;
        box-shadow: 4px 5px 5px 1px #777;
    }
     
    .shadowIE {
        background-color:#f5f5f5; /* need for IE*/
        -moz-box-shadow: 4px 5px 5px 1px #777;
        -webkit-box-shadow: 4px 5px 5px 1px #777;
        box-shadow: 4px 5px 5px 1px #777;
        filter: progid:DXImageTransform.Microsoft.Blur
        (PixelRadius=3,MakeShadow=true,ShadowOpacity=0.30);
        -ms-filter: "progid:DXImageTransform.Microsoft.Blur
        (PixelRadius=3,MakeShadow=true,ShadowOpacity=0.30)";
        zoom: 1;
    }
    .shadowIE .content {
        position:relative;
        background-color:#f5f5f5;
    }
    </style>
     
    <div class="shadow">
        This is a Box-shadowed element.
    </div>
     
    <div class="shadowIE">
        <div class="content">
            This is a Box-shadowed element.
        </div>
    </div>