.modal-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    background: #131313;
    opacity: .85;
    filter: alpha(opacity=85);
    z-index: 101;
}
.modal-window {
    position: fixed;
    top: 50%;
    left: 50%;
    margin: 0;
    padding: 0;
    z-index: 102;
    background: #fff;
    border: solid 1px #fff;
    -moz-border-radius: 8px;
    -webkit-border-radius: 8px;
}
.close-window {
    position: absolute;
    width: 47px;
    height: 47px;
    right: -23px;
    top: -23px;
    background: transparent url(../img/btn-cerrar.png) no-repeat scroll right top;
    text-indent: -99999px;
    overflow: hidden;
    cursor: pointer;
}