drupalcampbristol/core/themes/classy/templates/block/block--local-tasks-block.html.twig

{% extends "@block/block.html.twig" %}
{#
/**
 * @file
 * Theme override for tabs.
 */
#}
{% block content %}
  {% if content %}
    <nav class="tabs" role="navigation" aria-label="{{ 'Tabs'|t }}">
      {{ content }}
    </nav>
  {% endif %}
{% endblock %}