diff --git a/web/app/templates/nopaque.html.j2 b/web/app/templates/nopaque.html.j2
index b2e85dbe..94902c93 100644
--- a/web/app/templates/nopaque.html.j2
+++ b/web/app/templates/nopaque.html.j2
@@ -179,6 +179,8 @@
 </ul>
 {% endblock sidenav %}
 
+{% block main_attribs %} class="grey lighten-5"{% endblock main_attribs %}
+
 {% block main %}
   {% block page_content %}{% endblock page_content %}
 {% endblock main %}