rivet-1.0.x-dev/templates/regions/region--content-top.html.twig

{#
The Content Top region holds breadcrumbs and page title in a gray bar above the
sidebar and content areas for app-style layouts. Otherwise, it contains primary
tabs, secondary tabs, and Drupal "local tasks".
#}
{% if content %}
{{ attach_library('rivet/rvt-c-region') }}
{% apply spaceless %}
<div class="rvt-c-region rvt-c-region--content-top rvt-bg-black-000 rvt-border-bottom">
  <div class="rvt-c-region__inner {{ content_width }} rvt-prose rvt-flow rvt-p-bottom-xl">
    {{ content }}
  </div>
</div>
{% endapply %}
{% endif %}