rst/themes/lifescience-theme/sidenav.html

<div class="sidenav hidden-print hidden-xs hidden-sm affix-top" data-spy="affix" data-offset-top="0"
     data-offset-bottom="0">
    <section class="uui-accordion" id="accordion1">

        <!-- Filled in static/js/custom-sidenav.js -->
        <div id="local-toc" class="invisible">{{ toc }}</div>

    </section>
</div>