.modal_window {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    display: none;
    z-index: 30001;
}

.shadow {
    margin: 0;
    padding: 0;
    position: absolute;
    background-color: #000;
    display: none;
    top: 0;
    left: 0;
    margin-top: -30px;
    padding-top: 30px;
    z-index: 30000;
}