Index: themes/bartik/css/style.css
===================================================================
RCS file: /cvs/drupal/drupal/themes/bartik/css/style.css,v
retrieving revision 1.47
diff -u -r1.47 style.css
--- themes/bartik/css/style.css	9 Dec 2010 07:48:35 -0000	1.47
+++ themes/bartik/css/style.css	13 Dec 2010 11:41:13 -0000
@@ -1590,3 +1590,10 @@
 #footer-wrapper .poll .bar .foreground {
   background-color: #ddd;
 }
+/* Special case the iframe body element for WYSIWYG editors. */
+body.wysiwygeditor,
+body#tinymce {
+  background: #fff;
+  color: #000;
+  padding: 5px;
+}
Index: themes/bartik/template.php
===================================================================
RCS file: /cvs/drupal/drupal/themes/bartik/template.php,v
retrieving revision 1.12
diff -u -r1.12 template.php
--- themes/bartik/template.php	6 Dec 2010 19:34:33 -0000	1.12
+++ themes/bartik/template.php	13 Dec 2010 11:41:12 -0000
@@ -152,3 +152,10 @@
 
   return $output;
 }
+
+/**
+ * Set a class on the iframe body element for WYSIWYG editors
+ */
+function bartik_wysiwyg_editor_settings_alter(&$settings, &$context) {
+  $settings['bodyClass'] = 'wysiwygeditor';
+}