aria2/doc/sphinx_themes/sphinx_rtd_theme/footer.html

<footer>
  {% if next or prev %}
    <div class="rst-footer-buttons">
      {% if next %}
        <a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}"/>Next <span class="icon icon-circle-arrow-right"></span></a>
      {% endif %}
      {% if prev %}
        <a href="{{ prev.link|e }}" class="btn btn-neutral" title="{{ prev.title|striptags|e }}"><span class="icon icon-circle-arrow-left"></span> Previous</a>
      {% endif %}
    </div>
  {% endif %}

  <hr/>

  <p>
  {%- if show_copyright %}
    {%- if hasdoc('copyright') %}
      {% trans path=pathto('copyright'), copyright=copyright|e %}&copy; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
    {%- else %}
      {% trans copyright=copyright|e %}&copy; Copyright {{ copyright }}.{% endtrans %}
    {%- endif %}
  {%- endif %}

  {%- if last_updated %}
    {% trans last_updated=last_updated|e %}Last updated on {{ last_updated }}.{% endtrans %}
  {%- endif %}
  </p>

  {% trans %}<a href="https://www.github.com/snide/sphinx_rtd_theme">Sphinx theme</a> provided by <a href="http://readthedocs.org">Read the Docs</a>{% endtrans %}
</footer>