diff --git a/addons/web/static/src/js/core/dialog.js b/addons/web/static/src/js/core/dialog.js
index 492ea06c7bd..83eded92c8a 100644
--- a/addons/web/static/src/js/core/dialog.js
+++ b/addons/web/static/src/js/core/dialog.js
@@ -143,7 +143,11 @@ var Dialog = Widget.extend({
                     $.when(def).always(self.close.bind(self));
                 }
             });
-            self.$footer.append($button);
+            if (self.technical) {
+                self.$footer.append($button);
+            } else {
+                self.$footer.prepend($button);
+            }
         });
     },
 
diff --git a/addons/website/static/src/scss/website.scss b/addons/website/static/src/scss/website.scss
index 09946969873..3b95a9f06cf 100644
--- a/addons/website/static/src/scss/website.scss
+++ b/addons/website/static/src/scss/website.scss
@@ -1066,3 +1066,8 @@ table.table_desc tr td {
         background-color: rgba($value, 0.1);
     }
 }
+
+// TODO: Will be handled properly in master/saas-12.2, temp fix for website_event.registration_attendee_details
+.modal-footer > .float-left {
+    margin-right: auto;
+}