.image-loading-container 
{
    position: fixed;
    text-align: center;
    height: 100%;
    width: 100%;
    top: 0;
    right: 0;
    left: 0;
    z-index: 9999999;
    background-color: #000000;
    opacity: 0.5;
}
.image-loading 
{
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
}