Index: wp-admin/css/admin-menu-rtl.css
===================================================================
--- wp-admin/css/admin-menu-rtl.css	(revision 28593)
+++ wp-admin/css/admin-menu-rtl.css	(working copy)
@@ -730,6 +730,17 @@
 
 }
 
+@media screen and ( max-width: 961px ) and ( min-width: 901px )  {
+
+	#wpbody-content #poststuff {
+		min-width: 690px;
+	}
+
+	#post-body-content {
+		min-width: 390px;
+	}
+}
+
 @media screen and ( max-width: 782px ) {
 	.auto-fold #wpcontent {
 		position: relative;
Index: wp-admin/css/admin-menu.css
===================================================================
--- wp-admin/css/admin-menu.css	(revision 28593)
+++ wp-admin/css/admin-menu.css	(working copy)
@@ -730,6 +730,17 @@
 
 }
 
+@media screen and ( max-width: 961px ) and ( min-width: 901px )  {
+
+	#wpbody-content #poststuff {
+		min-width: 690px;
+	}
+
+	#post-body-content {
+		min-width: 390px;
+	}
+}
+
 @media screen and ( max-width: 782px ) {
 	.auto-fold #wpcontent {
 		position: relative;