.loading {
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: 999;
    display: none;
    background: url('/Content/Landing/img/loader.gif') 50% 50% no-repeat rgba(0,0,0,0.4);
    background-size: 100px 100px;
}