grocery-manager/app/rest/templates/form.tpl

<form id="filter" method="{{ method }}" action="{{ action }}">
  % include('button-nav', action=action)
  <details style="padding: 1em 0">
    <summary>Click to expand filter...</summary>
      <div class="pure-g">
        <%
        include('filter-set',
          product=product, category=category, group=group,
          tags=tags, units=units)
        %>
    </div>
  </details>
</form>