--- /dev/null
+{#
+/**
+ * @file
+ * Default theme implementation for an administrative block.
+ *
+ * Available variables:
+ * - block: An array of information about the block, including:
+ * - show: A flag indicating if the block should be displayed.
+ * - title: The block title.
+ * - content: (optional) The content of the block.
+ * - description: (optional) A description of the block.
+ * (Description should only be output if content is not available).
+ *
+ * @ingroup themeable
+ */
+#}
+<div class="panel">
+ {% if block.title %}
+ <h3 class="panel__title">{{ block.title }}</h3>
+ {% endif %}
+ {% if block.content %}
+ <div class="panel__content">{{ block.content }}</div>
+ {% elseif block.description %}
+ <div class="panel__description">{{ block.description }}</div>
+ {% endif %}
+</div>