#pdfOver {
    position: absolute;
    left: -250px;
    width: 237px;
    height: 312px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.5);
    overflow: hidden;
    display: none;
    z-index: 100;
    background-color: white;
}

    #pdfOver .loader {
        position: absolute;
        background: rgba(64, 63, 63, 0.68);
        width: 100%;
        height: 100%;
    }

        #pdfOver .loader img {
            position: absolute;
            left: 50%;
            top: 50%;
            -moz-transform: translate(-50%, -50%);
            -ms-transform: translate(-50%, -50%);
            -o-transform: translate(-50%, -50%);
            -webkit-transform: translate(-50%, -50%);
            transform: translate(-50%, -50%);
        }

.pdf_list li a #pdfOver {
    display: block;
    position: absolute;
    right: -12rem;
    top: -1rem;
}

@media only screen and (max-width: 480px) {
    #pdfOver {
        display: none!important;
        visibility: hidden!important;
    }
}