Index: wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css
===================================================================
--- wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css	(revision 21468)
+++ wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css	(working copy)
@@ -37,13 +37,19 @@
 .mcePageBreak {display:block;border:0;width:100%;height:12px;border-top:1px dotted #ccc;margin-top:15px;background:#fff url(../../img/pagebreak.gif) no-repeat center top;}
 
 /* WordPress styles */
+html {
+	background: url('img/white.png') repeat-y center top;
+	background-color: #f5f5f5;
+	background-size: 650px auto;
+}
+
 body {
 	font-family: Georgia, "Times New Roman", "Bitstream Charter", Times, serif;
 	font-size: 13px;
 	line-height: 19px;
 	color: #333;
-	margin: 10px;
-	min-height: 100%;
+	margin: 15px auto;
+	max-width: 600px;
 }
 
 br[data-mce-bogus] {
Index: wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/white.png
===================================================================
Cannot display: file marked as a binary type.
svn:mime-type = application/octet-stream
Index: wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/white.png
===================================================================
--- wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/white.png	(revision 0)
+++ wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/white.png	(working copy)

Property changes on: wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/white.png
___________________________________________________________________
Added: svn:mime-type
## -0,0 +1 ##
+application/octet-stream
\ No newline at end of property