* - content: (optional) The content of the block.
* - description: (optional) A description of the block.
* (Description should only be output if content is not available).
+ * - attributes: HTML attributes for the containing div element.
*
* @ingroup themeable
*/
#}
-<div class="panel">
+{%
+ set classes = [
+ 'panel',
+ ]
+%}
+<div{{ attributes.addClass(classes) }}>
{% if block.title %}
<h3 class="panel__title">{{ block.title }}</h3>
{% endif %}