/* Shared styles */
        
        .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);
        }
        
        /* Curled corners */

        .curled {
            border:1px solid #efefef; 
            -moz-border-radius:0 0 120px 120px / 0 0 6px 6px;    
                 border-radius:0 0 120px 120px / 0 0 6px 6px;
        }
      
        .curled:before,
        .curled:after {
            bottom:12px;
            left:10px;
            width:50%;
            height:55%;
            max-width:200px;
            -webkit-box-shadow:0 8px 12px rgba(0, 0, 0, 0.5); 
               -moz-box-shadow:0 8px 12px rgba(0, 0, 0, 0.5); 
                    box-shadow:0 8px 12px rgba(0, 0, 0, 0.5); 
            -webkit-transform:skew(-8deg) rotate(-3deg);
               -moz-transform:skew(-8deg) rotate(-3deg);
                -ms-transform:skew(-8deg) rotate(-3deg);
                 -o-transform:skew(-8deg) rotate(-3deg);
                    transform:skew(-8deg) rotate(-3deg);
        } 
      
        .curled:after { 
            right:10px; 
            left:auto;
            -webkit-transform:skew(8deg) rotate(3deg); 
               -moz-transform:skew(8deg) rotate(3deg);     
                -ms-transform:skew(8deg) rotate(3deg);     
                 -o-transform:skew(8deg) rotate(3deg); 
                    transform:skew(8deg) rotate(3deg);
        }
        
        /* Perspective */

        .perspective:before {
            left:80px;
            bottom:5px;
            width:50%;
            height:35%;
            max-width:200px;
            -webkit-box-shadow:-80px 0 8px rgba(0, 0, 0, 0.4);
               -moz-box-shadow:-80px 0 8px rgba(0, 0, 0, 0.4);
                    box-shadow:-80px 0 8px rgba(0, 0, 0, 0.4);
            -webkit-transform:skew(50deg);
               -moz-transform:skew(50deg);
                -ms-transform:skew(50deg);
                 -o-transform:skew(50deg);
                    transform:skew(50deg);
            -webkit-transform-origin:0 100%;
               -moz-transform-origin:0 100%;
                -ms-transform-origin:0 100%;
                 -o-transform-origin:0 100%;
                    transform-origin:0 100%;
        }
        
        .perspective:after {
            display:none;
        }
        
        /* Raised shadow - no pseudo-elements needed */
        
        .raised {
            -webkit-box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
               -moz-box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
                    box-shadow: 0 15px 10px -10px rgba(0, 0, 0, 0.5), 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
        }
        
        /* Curved shadows */

        .curved:before {
            top:10px;
            bottom:10px;
            left:0;
            right:50%;
            -webkit-box-shadow:0 0 15px rgba(0,0,0,0.6);
            -moz-box-shadow:0 0 15px rgba(0,0,0,0.6);
            box-shadow:0 0 15px rgba(0,0,0,0.6);
            -moz-border-radius:10px / 100px;
            border-radius:10px / 100px;
        }
        
        .curved-vt-2:before {
            right:0;
        }
        
        .curved-hz-1:before {
            top:50%;
            bottom:0;
            left:10px;
            right:10px;
            -moz-border-radius:100px / 10px;
            border-radius:100px / 10px;
        }

        .curved-hz-2:before {
            top:0;
            bottom:0;
            left:10px;
            right:10px;
            -moz-border-radius:100px / 10px;
            border-radius:100px / 10px;
        }
        
        /* Rotated box */
        
        .rotated {
            -webkit-box-shadow:none;
               -moz-box-shadow:none;
                    box-shadow:none;
            -webkit-transform:rotate(-3deg);    
               -moz-transform:rotate(-3deg);   
                -ms-transform:rotate(-3deg);
                 -o-transform:rotate(-3deg);
                    transform:rotate(-3deg);
        }
        
        .rotated > :first-child:before {
            content:"";
            position:absolute;
            z-index:-1;
            top:0;
            bottom:0;
            left:0;
            right:0;
            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;
        }

/* HTML START */

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

            <p>Curled corners</p>
        </div>
        
        <div class="drop-shadow perspective">
            <p>Perspective</p>
        </div>
        
        <div class="drop-shadow raised">
            <p>Raised box</p>

        </div>

        <div class="drop-shadow curved curved-vt-1">
            <p>Single vertical curve</p>
        </div>

        <div class="drop-shadow curved curved-vt-2">
            <p>Vertical curves</p>
        </div>

        
        <div class="drop-shadow curved curved-hz-1">
            <p>Single horizontal curve</p>
        </div>
        
        <div class="drop-shadow curved curved-hz-2">
            <p>Horizontal curves</p>
        </div>


        <div class="drop-shadow lifted rotated">

            <p>Rotated box</p>
        </div>

/* HTML END */

http://nicolasgallagher.com/css-drop-shadows-without-images/demo/

Different CSS Drop-Shadows

CSS