div.btn{
    position: absolute;
    right: 100px;
    bottom: 39px;
    border: none;
}

div.btn > a{
    text-indent: -9999px;
    display: inline-block;
    width: 59px;
    height: 82px;
}

div.btn > a.pdf{
    background: url('../image/pdfbn.png') left top transparent;
}
div.btn > a.pdf:hover{
    background-image: url('../image/pdfcolor.png');
}

div.btn > a.epub{
    width: 66px;
    background: url('../image/epubbn.png') left top transparent;
}
div.btn > a.epub:hover{
    background-image: url('../image/epubcolor.png');
}

/* b */

.modalDialog {
    overflow-y: initial !important;
    position: fixed;
    font-family: Arial, Helvetica, sans-serif;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 99999;
    opacity:0;
    -webkit-transition: opacity 400ms ease-in;
    -moz-transition: opacity 400ms ease-in;
    transition: opacity 400ms ease-in;
    pointer-events: none;
}
.modalDialog:target {
    opacity:1;
    pointer-events: auto;
}
.modalDialog > div {
    width: 760px;
    height: 350px;
    position: relative;
    margin: 2% auto;
    padding: 5px 20px 13px 20px;
    border: solid 3px #4e99ce;
    border-radius: 10px;
    background: #ffffff;
}
.modalDialog div a.close {
    background: #4e99ce;
    color: #FFFFFF;
    line-height: 25px;
    position: absolute;
    right: -15px;
    text-align: center;
    top: -15px;
    width: 24px;
    text-decoration: none;
    font-weight: bold;
    -webkit-border-radius: 12px;
    -moz-border-radius: 12px;
    border-radius: 12px;
    -moz-box-shadow: 1px 1px 3px #000;
    -webkit-box-shadow: 1px 1px 3px #000;
    box-shadow: 1px 1px 3px #000;
}
.modalDialog div a.close:hover {
    background: #00d9ff;
}

/* END MODAL */