diff --git a/_layouts/default.html b/_layouts/default.html
index 41443fbc..5674537f 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -29,7 +29,7 @@
     </div>
 
     <div id="main_content_wrap" class="outer">
-      <section id="main_content" class="inner">
+      <section id="main_content" class="inner {{ page.title | downcase }}">
          {{ content }}
       </section>
     </div>