diff --git a/lib/action.php b/lib/action.php
index 975c2bfcb8..f9f3c35d97 100644
--- a/lib/action.php
+++ b/lib/action.php
@@ -299,7 +299,9 @@ class Action extends HTMLOutputter // lawsuit
      */
     function showBody()
     {
-        $this->elementStart('body', array('id' => $this->trimmed('action')));
+        $this->elementStart('body', (common_current_user()) ? array('id' => $this->trimmed('action'),
+                                                                    'class' => 'user_in')
+                                                            : array('id' => $this->trimmed('action')));
         $this->elementStart('div', array('id' => 'wrap'));
         if (Event::handle('StartShowHeader', array($this))) {
             $this->showHeader();