.helpdesk_preloader_new {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 3;
    display: none;
    background: #eef2f4;
    opacity: 0.6;
}

.helpdesk_preloader_new.active {
    display: block;
}