col-sm-12 col-md-9">
          {{ content }}
          {% include mailing-list.html %}
        </div>
        <div class="col-md-3 d-none d-md-block" id="sidebar">
          <nav id="toc" data-toggle="toc" class="sticky-top" style="z-index:1"></nav>
          {% if jekyll.environment == "production" %}
          <div style="position: fixed; bottom: 0px; right: 0px;">
            <div data-ea-publisher="markdownguide" data-ea-type="image"></div>
          </div>
          {% endif %}
        </div>
      </d