Index: src/wp-admin/css/forms.css
===================================================================
--- src/wp-admin/css/forms.css	(revision 41849)
+++ src/wp-admin/css/forms.css	(working copy)
@@ -1365,9 +1365,10 @@
 	}
 }
 
-@media only screen and (max-height: 480px) {
-	/*  Request Credentials */
-	.request-filesystem-credentials-dialog .notification-dialog{
+@media only screen and (max-height: 480px), screen and (max-width: 450px) {
+	/*  Request Credentials / File Editor Warning */
+	.request-filesystem-credentials-dialog .notification-dialog,
+	.file-editor-warning .notification-dialog {
 		width: 100%;
 		height: 100%;
 		max-height: 100%;