<card-body class="default-padding">
    {% if caller -%}
        {{ caller({'related_form_begin': related_form, 'opts': opts}) }}
    {% endif -%}
    {{ related_form._renderer['body']() }}
    {% if caller -%}
        {{ caller({'related_form_end': related_form, 'opts': opts}) }}
    {% endif -%}
</card-body>
