.overlay_loading{
    position: fixed;
    background:rgba(0,0,0,0.8);
    top:0;bottom: 0;
    left:0;right:0;
    width:100%;height:100%;
    z-index: 1100;
    display: none;
}
.overlay_loading .loading img{
    width:100px;height:100px;
    position: fixed;
    top:45%;left:45%;
}