#loading-img {
        background: Url("../Content/images/waiting.gif") center center no-repeat;
        height: 100%;
        z-index: 20;
    }

    .overlay {
        background: #e9e9e9;
        display: none;
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        opacity: 0.5;
    }