#window-loading {
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    z-index: 9998;
}

    #window-loading h5 {
        font-size: 1em;
        color: #fff;
        font-weight: 600;
        margin-top: 0px;
    }

    #window-loading div {
        position: absolute;
        top: 15%;
        left: 50%;
        transform: translate(-50%,-50%);
        padding: 5px;
        width: 140px;
        z-index: 9999;
        height: 25px;
        border-radius: 5px;
    }