rivet-1.0.x-dev/templates/block/block--region-header-local--menu-block.html.twig

<div{{attributes.addClass('rvt-header-local__inner')|without('id')}} data-rvt-disclosure="local-header-menu" data-rvt-close-click-outside>

  {{ title_prefix }}
  {% if label %}
    {% if '<a' in label|render|render|raw %}
      {% set label_link = label|render|render|raw|replace({'<a': '<a class="rvt-header-local__title"'}) %}
      {{ label_link|raw }}
    {% else %}
      <div {{ title_attributes.addClass('rvt-header-local__title') }}>{{ label }}</div>
    {% endif %}
  {% endif %}
  {{ title_suffix }}

  <button aria-expanded="false" class="rvt-global-toggle rvt-global-toggle--menu rvt-hide-lg-up" data-rvt-disclosure-toggle="local-header-menu">
    <span class="rvt-sr-only">Toggle {{ label }} menu</span>
    <svg fill="currentColor" width="16" height="16" viewBox="0 0 16 16"><path d="m15.146 6.263-1.292-1.526L8 9.69 2.146 4.737.854 6.263 8 12.31l7.146-6.047Z"></path></svg>
  </button>

  <nav aria-label="Secondary" class="rvt-header-menu rvt-c-header-menu" data-rvt-disclosure-target="local-header-menu" hidden>
    {{ content }}
  </nav>
</div>