D8_rplf/modules/field_group/templates/field-group-accordion.html.twig

{#
/**
 * @file
 * Default theme implementation for a fieldgroup accordion item.
 *
 * Available variables:
 * - children: The children of the group.
 * - attributes: A list of HTML attributes for the group wrapper.
 *
 * @see template_preprocess_field_group_accordion()
 *
 * @ingroup themeable
 */
#}
{%
  set classes = [
    'field-group-accordion-wrapper',
  ]
%}

<div {{ attributes.addClass(classes) }}>{{ children }}</div>