.zooming-img{
    cursor: zoom-in;
}
.preimg{
    position: fixed;
    z-index: 10000;
    top:0;
    right: 0;
    left: 0;
    bottom: 0;
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    background: url("../img/loading.gif") center no-repeat #000;
}
.preimg img{
    max-width: 100%;
    max-height: 100%;
}
.preimg,.preimg img{
    cursor: zoom-out;
}