/* loader div */
.loader_overlay {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    background-color: white;
}
.loader_overlay div {
    position: fixed;
    height: 7em;
    width: 7em;
    left: 50%;
    top: 50%;
    margin-left: -3.5em;
    margin-top: -3.5em;
    text-align: center;
}
.loader_overlay div i {
    font-size: 7em;
}