diff --git a/wagtail/wagtailforms/templates/wagtailforms/list_submissions.html b/wagtail/wagtailforms/templates/wagtailforms/list_submissions.html
index 2dcdb9bfd..804aa073d 100644
--- a/wagtail/wagtailforms/templates/wagtailforms/list_submissions.html
+++ b/wagtail/wagtailforms/templates/wagtailforms/list_submissions.html
@@ -22,7 +22,7 @@
                     </td>
                 {% endfor %}
                 <td>
-                <a class="button" href="
+                <a class="button button-small button-secondary" href="
                     {% url 'wagtailforms_delete_submission' form_page.id row.model_id %}">
                     delete</a>
                 </td>
diff --git a/wagtail/wagtailforms/views.py b/wagtail/wagtailforms/views.py
index d9f6d7db7..0ec4a0ed1 100644
--- a/wagtail/wagtailforms/views.py
+++ b/wagtail/wagtailforms/views.py
@@ -99,11 +99,10 @@ def list_submissions(request, page_id):
     for s in submissions:
         form_data = s.get_data()
         data_row = [s.submit_time] + [form_data.get(name) for name, label in data_fields]
-        data_rows.append(
-          {
+        data_rows.append({
             "model_id": s.id,
             "fields": data_row
-          })
+        })
 
     return render(request, 'wagtailforms/index_submissions.html', {
          'form_page': form_page,