#box-loading {
    display: none;
    position: fixed;
    left: 0;
    z-index: 1;
    top: 0;
    margin: auto;
    right: 0;
    height: 100%;
    width: 100%;
    background-color: rgb(192,192,192,0.5);
}
#box-loading img {
    bottom: 0;
    right: 0;
    margin: auto;
    position: fixed;
    opacity: 0.8;
    left: 0;
    top: 0;
}