netbox-community-netbox/netbox/templates/ipam/aggregate_edit.html

{% extends 'utilities/obj_edit.html' %}
{% load form_helpers %}

{% block form %}
    <div class="panel panel-default">
        <div class="panel-heading"><strong>Aggregate</strong></div>
        <div class="panel-body">
            {% render_field form.prefix %}
            {% render_field form.rir %}
            {% render_field form.date_added %}
            {% render_field form.description %}
        </div>
    </div>
    {% if form.custom_fields %}
        <div class="panel panel-default">
            <div class="panel-heading"><strong>Custom Fields</strong></div>
            <div class="panel-body">
                {% render_custom_fields form %}
            </div>
        </div>
    {% endif %}
{% endblock %}