diff --git a/agaric/templates/webform/webform-confirmation.html.twig b/agaric/templates/webform/webform-confirmation.html.twig
index 95499ba..6892558 100644
--- a/agaric/templates/webform/webform-confirmation.html.twig
+++ b/agaric/templates/webform/webform-confirmation.html.twig
@@ -19,7 +19,7 @@
   {{ progress }}
 {% endif %}
 
-<div{{ attributes.addClass('webform-confirmation') }}>
+<div{{ attributes.addClass('webform-confirmation container') }}>
 
   {% if message %}
     <div class="webform-confirmation__message">{{ message }}</div>