diff -r c7c34916027a -r 177826044cd9 wp/wp-admin/css/code-editor-rtl.css
--- a/wp/wp-admin/css/code-editor-rtl.css	Mon Oct 14 18:06:33 2019 +0200
+++ b/wp/wp-admin/css/code-editor-rtl.css	Mon Oct 14 18:28:13 2019 +0200
@@ -28,7 +28,7 @@
 
 .wp-core-ui .CodeMirror-lint-message-error,
 .wp-core-ui .CodeMirror-lint-message-warning {
-	box-shadow: 0 1px 1px 0 rgba( 0, 0, 0, 0.1 );
+	box-shadow: 0 1px 1px 0 rgba(0, 0, 0, 0.1);
 	margin: 5px 0 2px;
 	padding: 3px 28px 3px 12px;
 }
@@ -63,10 +63,14 @@
 }
 
 .wrap .CodeMirror .CodeMirror-matchingbracket {
-	background: rgba(255, 150, 0, .3);
+	background: rgba(255, 150, 0, 0.3);
 	color: inherit;
 }
 
 .CodeMirror {
 	text-align: right;
 }
+
+.wrap .CodeMirror .CodeMirror-linenumber {
+	color: #666;
+}