.sombrasLaterales{
    background-color: #fafafa;
    position: relative;
    padding: 1em;
    margin: 0px 0px 0;
    -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;
}
.sombrasLaterales:before, .sombrasLaterales:after{
    content: "";
    position: absolute;
    z-index: -2;
    /*sombras laterales*/
    top: 10px;
    bottom: 0px;
    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: 5px / 100px;
    border-radius: 5px / 100px;
    right: 0px;
}