docs/theme/mkdocs/prev_next.html

<ul id="nav_prev_next" class="nav navbar-nav">
    <li class="prev{% if not previous_page %} disabled{% endif %}">
        <a rel="next" {% if previous_page %}href="{{ previous_page.url }}"{% endif %}>
            <i class="glyphicon glyphicon-chevron-left"></i> Previous Doc
            <span>{{ previous_page.title }}</span>
        </a>
    </li>
    <li class="next{% if not next_page %} disabled{% endif %}">
        <a rel="prev" {% if next_page %}href="{{ next_page.url }}"{% endif %}>
            Next Doc <i class="glyphicon glyphicon-chevron-right"></i>
            <span>{{ next_page.title }}</span>
        </a>
    </li>
</ul>

<ul id="scroll_to_top" class="nav navbar-nav">
    <li>
        <a href="#">
            <i class="glyphicon glyphicon-chevron-up"></i> Up!
        </a>
    </li>
</ul>