tweaks to unusual formatting

wagtail/wagtailsites/templates/wagtailsites/confirm_delete.html

@@ -7,7 +7,7 @@
     {% trans "Delete site" as del_str %}
     {% include "wagtailadmin/shared/header.html" with title=del_str subtitle=site.hostname icon="site" %}
 
-    <div class="row row-flush nice-padding">
+    <div class="nice-padding">
         <p>{% trans "Are you sure you want to delete this site?" %}</p>
         <form action="{% url 'wagtailsites_delete' site.id %}" method="POST">
             {% csrf_token %}