Index: wp-admin/css/wp-admin-rtl.dev.css
===================================================================
--- wp-admin/css/wp-admin-rtl.dev.css	(revision 20489)
+++ wp-admin/css/wp-admin-rtl.dev.css	(working copy)
@@ -739,7 +739,7 @@
   11.0 - Write/Edit Post Screen
 ------------------------------------------------------------------------------*/
 /* structural/layout */
-#post-body-content {
+#poststuff #post-body-content {
 	float: right;
 }
 
Index: wp-admin/css/wp-admin.dev.css
===================================================================
--- wp-admin/css/wp-admin.dev.css	(revision 20489)
+++ wp-admin/css/wp-admin.dev.css	(working copy)
@@ -1871,7 +1871,7 @@
 	padding: 0;
 }
 
-#post-body-content {
+#poststuff #post-body-content {
 	width: 100%;
 	float: left;
 }