@doneproperly/gitbook-plugin-theme-doneproperly-default/_layouts/ebook/pdf_footer.html

Default theme for GitBook

{% extends "./page.html" %}

{% block body %}
<div class="pdf-footer">
    <span>{{ page.section }}</span>
    <span class="footer-pages-count">{{ page.num }}</span>
</div>
{% endblock %}