.loading-content {
    position: fixed;
    z-index: 1000000000000;
    display: flex;
    align-items: center;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(128,128,128, 0.3);
    background-image: url('icons/loading_icons/gif-part-22.gif');
    background-position: center;
    background-size: 250px;
    background-repeat: no-repeat;
}