diff --git a/agaric/templates/block/block.html.twig b/agaric/templates/block/block.html.twig
index dca6f48..e5b4378 100644
--- a/agaric/templates/block/block.html.twig
+++ b/agaric/templates/block/block.html.twig
@@ -25,13 +25,23 @@
  * @see template_preprocess_block()
  */
 #}
-<div{{ attributes }}>
-  {{ title_prefix }}
-  {% if label %}
-    <h2{{ title_attributes }}>{{ label }}</h2>
-  {% endif %}
-  {{ title_suffix }}
-  {% block content %}
-    {{ content }}
-  {% endblock %}
-</div>
+<section {{ attributes }}.addClass('section'>
+  <div class="container">
+    <div class="frow content">
+      <div class="flow_full">
+        {{ title_prefix }}
+        {% if label %}
+        <div class="titlebar titlebar-bigborder content">
+          <div class="titlebar_title">
+            <h3{{ title_attributes }}.addClass(['subtitle', 'is-mono', 'is-4']>{{ label }}</h3>
+          </div>
+        </div>
+        {% endif %}
+        {{ title_suffix }}
+        {% block content %}
+          {{ content }}
+        {% endblock %}
+      </div>
+    </div>
+  </div>
+</section>