diff --git a/pagestyle.module b/pagestyle.module
index d212171..eceb85c 100644
--- a/pagestyle.module
+++ b/pagestyle.module
@@ -293,6 +293,7 @@ function pagestyle_print_html() {
       );
   }
   $attributes_black_white = array(
+    'class' => array('ps_black_white'),
     'rel' => $pagestyle_rel['black_white'] . 'stylesheet',
     'type' => 'text/css',
     'media' => 'screen, projection, tty, tv',
@@ -300,6 +301,7 @@ function pagestyle_print_html() {
     'href' => $uri . '/css/style_black_white.css',
   );
   $attributes_white_black = array(
+    'class' => array('ps_white_black'),
     'rel' => $pagestyle_rel['white_black'] . 'stylesheet',
     'type' => 'text/css',
     'media' => 'screen, projection, tty, tv',
@@ -307,6 +309,7 @@ function pagestyle_print_html() {
     'href' => $uri . '/css/style_white_black.css',
   );
   $attributes_yellow_blue = array(
+    'class' => array('ps_yellow_blue'),
     'rel' => $pagestyle_rel['yellow_blue'] . 'stylesheet',
     'type' => 'text/css',
     'media' => 'screen, projection, tty, tv',
@@ -314,6 +317,7 @@ function pagestyle_print_html() {
     'href' => $uri . '/css/style_yellow_blue.css',
   );
   $attributes_standard = array(
+    'class' => array('ps_standard'),
     'rel' => $pagestyle_rel['standard'] . 'stylesheet',
     'type' => 'text/css',
     'media' => 'screen, projection, tty, tv',