.block {
    padding: 20px;
    background: #FFFFFF;
    box-shadow: 0 0 50px #66CDAA inset, 5px 5px 0 #CECECE;
    -moz-box-shadow: 0 0 50px #66CDAA inset, 5px 5px 0 #CECECE;
    -webkit-box-shadow: 0 0 50px #66CDAA inset, 5px 5px 0 #CECECE;
}