diff --git a/templates/layout.html.twig b/templates/layout.html.twig
index 1fff22c..efe218d 100644
--- a/templates/layout.html.twig
+++ b/templates/layout.html.twig
@@ -14,5 +14,6 @@
         </div>
         {% block content %}{% endblock %}
         {% include '_partials/_loading_indicator.html.twig' %}
+        <div data-iframe-size></div>
     </div>
 {% endblock %}
\ No newline at end of file