.loader {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 1;
    width: 200px;
    height: 200px;
    margin: -76px 0 0 -76px;
    background: url("../images/double_ring.gif");
}

.overlay-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    opacity: .8;
    position: fixed;
    z-index: 998;
    height: 100%;
    width: 100%;
    right: 0;
    bottom: 0;
}

.op0 {
    opacity: 0.2;
}

.show {
    display: block;
}

.hide {
    display: none;
}