diff --git a/core/themes/classy/templates/radios.html.twig b/core/themes/classy/templates/radios.html.twig
new file mode 100644
index 0000000..bf38830
--- /dev/null
+++ b/core/themes/classy/templates/radios.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'radios' #type form element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The rendered radios.
+ *
+ * @see template_preprocess_radios()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('form-radios') }}>{{ children }}</div>
diff --git a/core/themes/classy/templates/region.html.twig b/core/themes/classy/templates/region.html.twig
new file mode 100644
index 0000000..b2c5471
--- /dev/null
+++ b/core/themes/classy/templates/region.html.twig
@@ -0,0 +1,27 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display a region.
+ *
+ * Available variables:
+ * - content: The content for this region, typically blocks.
+ * - attributes: HTML attributes for the region div.
+ * - region: The name of the region variable as defined in the theme's
+ *   .info.yml file.
+ *
+ * @see template_preprocess_region()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'region',
+    'region-' ~ region|clean_class,
+  ]
+%}
+{% if content %}
+  <div{{ attributes.addClass(classes) }}>
+    {{ content }}
+  </div>
+{% endif %}