diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index f888676..6acb66e 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -4293,6 +4293,13 @@ function theme_confirm_form($variables) {
 }
 
 /**
+ * Preprocess variables for a confirmation form.
+ */
+function template_preprocess_confirm_form(&$variables) {
+  $variables['form'] = drupal_render_children($variables['form']);
+}
+
+/**
  * Returns HTML for a system settings form.
  *
  * By default this does not alter the appearance of a form at all,
diff --git a/core/themes/stark/templates/system/confirm-form.html.twig b/core/themes/stark/templates/system/confirm-form.html.twig
new file mode 100644
index 0000000..ba541de
--- /dev/null
+++ b/core/themes/stark/templates/system/confirm-form.html.twig
@@ -0,0 +1,18 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a confirmation form.
+ *
+ * By default this does not alter the appearance of a form at all,
+ * but is provided as a convenience for themers.
+ *
+ * Available variables:
+ * - form: A render element representing the form.
+ *
+ * @see template_preprocess()
+ * @see template_preprocess_confirm_form()
+ *
+ * @ingroup themeable
+ */
+#}
+{{ form }}