#flipbook {
    width: 100%;
    height: 500px;
    padding:0px !important;
    margin:0px !important;
}

    #flipbook .turn-page {
        width: 400px;
        height: 500px;
        background-color: #ccc;
        background-size: 100% 100%;
    }

    #flipbook .pdf-loader{
        font-size:100px;
        display:block;
        margin:20% auto 0px auto;
    }
    #flipbook .pdf-nav{margin-top:10px;}