CSS3 Lifted Corner Shadows

Created for: http://stackoverflow.com/questions/10541315/best-way-to-do-this-kind-of-drop-shadow/10541430#10541430

by Nate Balcom

HTML

<div class="drop-shadow lifted">
    <p>Lifted corners</p>
</div>

CSS

/* some presentation styles */
body {
    padding:20px 0 30px;
    font:14px/1.5 Arial, sans-serif;
    text-align:center;
    color:#333;
    background:#FAF0D9;
}

.drop-shadow {
    position:relative;
    float:left;
    width:40%;    
    padding:1em; 
    margin:2em 10px 4em; 
    background:#fff;
    -webkit-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
       -moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
            box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}

.drop-shadow:before,
.drop-shadow:after {
    content:"";
    position:absolute; 
    z-index:-2;
}

.drop-shadow p {
    font-size:16px;
    font-weight:bold;
}

/* Lifted corners */

.lifted {
    -moz-border-radius:4px; 
         border-radius:4px;
}

.lifted:before,
.lifted:after { 
    bottom:15px;
    left:10px;
    width:50%;
    height:20%;
    max-width:300px;
    -webkit-box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);   
       -moz-box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);
            box-shadow:0 15px 10px rgba(0, 0, 0, 0.7);
    -webkit-transform:rotate(-3deg);    
       -moz-transform:rotate(-3deg);   
        -ms-transform:rotate(-3deg);   
         -o-transform:rotate(-3deg);
            transform:rotate(-3deg);
}

.lifted:after {
    right:10px; 
    left:auto;
    -webkit-transform:rotate(3deg);   
       -moz-transform:rotate(3deg);  
        -ms-transform:rotate(3deg);  
         -o-transform:rotate(3deg);
            transform:rotate(3deg);
}