Index: src/wp-admin/css/common.css
===================================================================
--- src/wp-admin/css/common.css	(revision 40569)
+++ src/wp-admin/css/common.css	(working copy)
@@ -779,7 +779,7 @@
 #bulk-titles div a:before,
 .notice-dismiss:before {
 	background: none;
-	color: #b4b9be;
+	color: #72777c;
 	content: "\f153";
 	display: block;
 	font: normal 16px/20px dashicons;
@@ -1417,7 +1417,7 @@
 	margin: 0;
 	padding: 9px;
 	background: none;
-	color: #b4b9be;
+	color: #72777c;
 	cursor: pointer;
 }
 
Index: src/wp-admin/css/media.css
===================================================================
--- src/wp-admin/css/media.css	(revision 40569)
+++ src/wp-admin/css/media.css	(working copy)
@@ -506,7 +506,7 @@
 	content: "\f153";
 	display: block;
 	font: normal 16px/1 dashicons;
-	color: #b4b9be;
+	color: #72777c;
 }
 
 .upload-php .mode-grid .media-sidebar .media-uploader-status .upload-dismiss-errors:focus:before,
Index: src/wp-includes/css/media-views.css
===================================================================
--- src/wp-includes/css/media-views.css	(revision 40569)
+++ src/wp-includes/css/media-views.css	(working copy)
@@ -1272,12 +1272,25 @@
 
 .media-sidebar .media-uploader-status .upload-dismiss-errors {
 	position: absolute;
-	top: 0;
-	right: 0;
+	top: -10px;
+	right: -10px;
+	padding: 10px;
 	-webkit-transition: none;
 	transition: none;
 }
 
+.media-sidebar .media-uploader-status .upload-dismiss-errors:before {
+	content: "\f153";
+	display: block;
+	font: normal 16px/1 dashicons;
+	color: #72777c;
+}
+
+.media-sidebar .media-uploader-status .upload-dismiss-errors:hover:before,
+.media-sidebar .media-uploader-status .upload-dismiss-errors:focus:before {
+	color: #c00;
+}
+
 .upload-errors .upload-error {
 	padding: 12px;
 	margin-bottom: 12px;
Index: src/wp-includes/css/wp-pointer.css
===================================================================
--- src/wp-includes/css/wp-pointer.css	(revision 40569)
+++ src/wp-includes/css/wp-pointer.css	(working copy)
@@ -61,7 +61,7 @@
 
 .wp-pointer-buttons a.close:before {
 	background: none;
-	color: #b4b9be;
+	color: #72777c;
 	content: "\f153";
 	display: block !important;
 	font: normal 16px/1 dashicons;