diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index 49cf836..97312f4 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -51,11 +51,11 @@ function seven_preprocess_node_add_list(&$variables) {
 }
 
  /**
-  * Overrides theme_custom_block_add_list().
   * Overrides variables for custom-block-add-list.html.twig
   * Add variables for the label and the path separately.
   *
-  * Displays the list of available custom block types for creation.
+  * Displays the list of available custom block types for creation, adding
+  * separate variables for the label and the path.
   *
   */
 function seven_preprocess_custom_block_add_list(&$variables) {
diff --git a/core/themes/seven/templates/custom-block-add-list.html.twig b/core/themes/seven/templates/custom-block-add-list.html.twig
index 529f0bd..cc66b21 100644
--- a/core/themes/seven/templates/custom-block-add-list.html.twig
+++ b/core/themes/seven/templates/custom-block-add-list.html.twig
@@ -1,12 +1,17 @@
 {#
 /**
- * Default theme implementation to present the content of a custom block.
+ * @file
+ * Overrides custom-block-add-list.html.twig.
+ *
+ * Displays the list of available custom block types for creation.
  *
  * Available variables:
  * - types: A collection of all the available custom block types.
  *   - type: The custom block type, containing all the items below.
  *   - type.link: A link to add a block of this type.
  *   - type.description: A description of this custom block type.
+ *   - type.label: The title of the custom block type.
+ *   - type.path: A path for the link to add a block of this type.
  *
  * @see template_preprocess()
  * @see template_preprocess_custom_block_add_list()
@@ -14,9 +19,10 @@
  * @ingroup themeable
  */
  #}
-<dl class="node-type-list">
+<ul class="admin-list">
   {% for type in types %}
-    <dt>{{ type.link }}</dt>
-    <dd>{{ type.description }}</dd>
+    <li class="clearfix">
+      <a href="{{ type.path }}"><span class="label">{{ type.label }}</span><div class="description">{{ type.description }}</div></a>
+    </li>
   {% endfor %}
-</dl>
+</ul>