Index: wp-admin/css/edit.css
===================================================================
--- wp-admin/css/edit.css	(revision 28593)
+++ wp-admin/css/edit.css	(working copy)
@@ -1161,6 +1161,16 @@
 	}
 }
 
+@media screen and ( max-width: 975px ) and ( min-width: 901px )  {
+	#poststuff {
+		min-width: 690px;
+	}
+
+	#post-body-content {
+		min-width: 390px;
+	}
+}
+
 /* one column on the post write/edit screen */
 @media only screen and (max-width: 850px) {
 	#poststuff {