Index: wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css
===================================================================
--- wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css	(revision 17979)
+++ wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css	(working copy)
@@ -78,8 +78,7 @@
 
 body.mceContentBody {
 	font: 13px/19px Georgia, "Times New Roman", "Bitstream Charter", Times, serif;
-	padding: 0.6em;
-	margin: 0;
+	margin: 0.6em;
 }
 
 pre {