netbox/netbox/templates/generic/_base.html

{% extends 'base/layout.html' %}

{% block header %}
  <div class="page-header m-0">
    {{ block.super }}

    {% block page-header %}
      <div class="container-fluid mt-2 d-print-none">
        <div class="d-flex justify-content-between">

          {# Title #}
          <div>
            <h1 class="page-title">{% block title %}{% endblock title %}</h1>
            {% block subtitle %}{% endblock %}
          </div>

          {# Controls #}
          <div class="d-print-none">
            {% block controls %}
              <div class="btn-list">
                {% block control-buttons %}{% endblock %}
              </div>
            {% endblock controls %}
          </div>

        </div>
      </div>
    {% endblock %}

    {# Tabs #}
    <div class="page-tabs mt-3">
      <div class="container-fluid">
        {% block tabs %}{% endblock %}
      </div>
    </div>

  </div>
{% endblock header %}