Replace prepend-left-20 in project/web_hooks

app/views/shared/web_hooks/_form.html.haml

@@ -10,7 +10,7 @@
   = s_('Webhooks|Use this token to validate received payloads. It will be sent with the request in the X-Gitlab-Token HTTP header.')
 .form-group
   = form.label :url, s_('Webhooks|Trigger'), class: 'label-bold'
-  %ul.list-unstyled.prepend-left-20
+  %ul.list-unstyled.gl-ml-6
     %li
       = form.check_box :push_events, class: 'form-check-input'
       = form.label :push_events, class: 'list-label form-check-label ml-1' do