Index: src/wp-admin/css/common.css
===================================================================
--- src/wp-admin/css/common.css	(revision 29574)
+++ src/wp-admin/css/common.css	(working copy)
@@ -2533,6 +2533,11 @@
 	transition: color .1s ease-in-out, background .1s ease-in-out;
 }
 
+body.plugin-install-php #TB_closeWindowButton:focus,
+body.import-php #TB_closeWindowButton:focus,
+body.plugins-php #TB_closeWindowButton:focus,
+body.update-core-php #TB_closeWindowButton:focus,
+body.index-php #TB_closeWindowButton:focus,
 body.plugin-install-php #TB_closeWindowButton:focus .tb-close-icon,
 body.import-php #TB_closeWindowButton:focus .tb-close-icon,
 body.plugins-php #TB_closeWindowButton:focus .tb-close-icon,