The current version adds the class "ie6" to the body to all browsers that aren't internet explorer. The body element should look like this instead. <!--[if lt IE 7 ]> <body <?php body_class('ie6'); ?>> <![endif]--> <!--[if IE 7 ]> <body <?php body_class('ie7'); ?>> <![endif]--> <!--[if IE 8 ]> <body <?php body_class('ie8'); ?>> <![endif]--> <!--[if IE 9 ]> <body <?php body_class('ie9'); ?>> <![endif]--> <!--[if (gt IE 9)|!(IE)]><!--> <body <?php body_class(); ?>> <!--<![endif]-->