diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/js/thickbox/thickbox.css
--- a/wp/wp-includes/js/thickbox/thickbox.css	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/js/thickbox/thickbox.css	Tue Dec 15 13:49:49 2020 +0100
@@ -143,7 +143,7 @@
 
 #TB_closeWindowButton:hover .tb-close-icon,
 #TB_closeWindowButton:focus .tb-close-icon {
-	color: #00a0d2;
+	color: #006799;
 }
 
 #TB_closeWindowButton:focus .tb-close-icon {