diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt
index 5bb7905986..19c5a2bae8 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt
@@ -12,7 +12,7 @@
 </title>
 [% INCLUDE 'doc-head-close.inc' %]
 </head>
-<body id="main_auth">
+<body id="main_auth" class="main_main-auth">
 
 <div id="doc" class="yui-t7">
    <div id="bd">