#cargando {
    position: absolute;
    left: 0;
    top: 0;
    z-index: 9999;
    /*border: 1px solid black;*/
    top: 0;
    z-index: 9999;
    width: 100%;
    height: 100vh;
    background: rgba(0,0,0,0.8);
}

    #cargando .lib {
        margin: 20% auto;
        position: center;
        background: #fff;
        color: rgb(0,0,0);
        -webkit-box-shadow: 0px 0px 28px 35px rgba(255,255,255,1);
        -moz-box-shadow: 0px 0px 28px 35px rgba(255,255,255,1);
        box-shadow: 0px 0px 5px 2px rgba(255,255,255,1);
        width: 460px;
        height: 190px;
        border-radius: 3px;
    }