tom: 0px !important;
    }
    /* Markdown */
    .markdown-section sup, .markdown-section sub {
        font-size: 75%;
    }

    .book_footer{
        text-align: center;
        color: #000000;
        background: #ddd;
        font-size: 16px;
        margin-top: 16px;
        padding: 16px;
    }
    /* Hide footer on mobile */
    /* Use navigation width */
    @media (max-width: 1240px) {
        .book_footer {
            display: none;
        }
    }
</style>
<meta name="theme-color" content="#ff