html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: #333333;
    overflow: hidden;
}

#df_manual_book {
    width: 100%;
    height: 100%;
}

#o_catalog_close {
    position: fixed;
    top: 12px;
    right: 16px;
    z-index: 10000;
    color: #ffffff;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    opacity: 0.8;
    -webkit-user-select: none;
    user-select: none;
}

#o_catalog_close:hover {
    opacity: 1;
}