Initial Drupal 11 with DDEV setup

web/core/modules/system/templates/admin-block.html.twig

@@ -0,0 +1,32 @@
+{#
+/**
+ * @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).
+ * - attributes: HTML attributes for the containing div element.
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'panel',
+  ]
+%}
+<div{{ attributes.addClass(classes) }}>
+  {% 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>