diff --git a/core/modules/aggregator/templates/aggregator-feed.html.twig b/core/modules/aggregator/templates/aggregator-feed.html.twig
index 1876c45..57f7d15 100644
--- a/core/modules/aggregator/templates/aggregator-feed.html.twig
+++ b/core/modules/aggregator/templates/aggregator-feed.html.twig
@@ -18,7 +18,7 @@
  * @ingroup themeable
  */
 #}
-<div{{ attributes.addClass('aggregator-feed') }}>
+<div>
 
   {{ title_prefix }}
   {% if not full %}
diff --git a/core/modules/aggregator/templates/aggregator-item.html.twig b/core/modules/aggregator/templates/aggregator-item.html.twig
index 8f31937..1f04de5 100644
--- a/core/modules/aggregator/templates/aggregator-item.html.twig
+++ b/core/modules/aggregator/templates/aggregator-item.html.twig
@@ -16,9 +16,9 @@
  * @ingroup themeable
  */
 #}
-<div{{ attributes.addClass('aggregator-item') }}>
+<div>
   {{ title_prefix }}
-  <h3 class="feed-item-title">
+  <h3>
     <a href="{{ url }}">{{ title }}</a>
   </h3>
   {{ title_suffix }}
diff --git a/core/themes/classy/templates/aggregator-block-item.html.twig b/core/themes/classy/templates/aggregator-block-item.html.twig
new file mode 100644
index 0000000..c5a7f3c
--- /dev/null
+++ b/core/themes/classy/templates/aggregator-block-item.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for feed item for display in the block.
+ *
+ * Available variables:
+ * - url: URL to the feed item.
+ * - title: Title of the feed item.
+ *
+ * @see template_preprocess_aggregator_block_item()
+ *
+ * @ingroup themeable
+ */
+#}
+<a href="{{ url }}">{{ title }}</a>
diff --git a/core/modules/aggregator/templates/aggregator-feed.html.twig b/core/themes/classy/templates/aggregator-feed.html.twig
similarity index 100%
copy from core/modules/aggregator/templates/aggregator-feed.html.twig
copy to core/themes/classy/templates/aggregator-feed.html.twig
diff --git a/core/modules/aggregator/templates/aggregator-item.html.twig b/core/themes/classy/templates/aggregator-item.html.twig
similarity index 100%
copy from core/modules/aggregator/templates/aggregator-item.html.twig
copy to core/themes/classy/templates/aggregator-item.html.twig