diff --git a/opentech/templates/base.html b/opentech/templates/base.html
index e2699382f6746b87218a6f5c22d40b4f73d177b0..7042b761b9807b67e6061ccd4e2a6c1fec59511a 100644
--- a/opentech/templates/base.html
+++ b/opentech/templates/base.html
@@ -143,7 +143,7 @@
             <svg class="header__icon header__icon--pixels header__icon--pixels-right"><use xlink:href="#hero-standard-right-pixels"></use></svg>
         </header>
 
-        <main class="wrapper wrapper--large wrapper--main">
+        <main class="wrapper wrapper--large wrapper--main {% block main_modifier %}{% endblock %}">
             {% block content %}{% endblock %}
         </main>