Index: wp-admin/async-upload.php
===================================================================
--- wp-admin/async-upload.php	(revision 39139)
+++ wp-admin/async-upload.php	(working copy)
@@ -91,7 +91,7 @@
 $id = media_handle_upload( 'async-upload', $post_id );
 if ( is_wp_error($id) ) {
 	echo '<div class="error-div error">
-	<a class="dismiss" href="#" onclick="jQuery(this).parents(\'div.media-item\').slideUp(200, function(){jQuery(this).remove();});">' . __('Dismiss') . '</a>
+	<button class="dismiss button-link" onclick="jQuery(this).parents(\'div.media-item\').slideUp(200, function(){jQuery(this).remove();});">' . __('Dismiss') . '</button>
 	<strong>' . sprintf(__('&#8220;%s&#8221; has failed to upload.'), esc_html($_FILES['async-upload']['name']) ) . '</strong><br />' .
 	esc_html($id->get_error_message()) . '</div>';
 	exit;
Index: wp-admin/css/media.css
===================================================================
--- wp-admin/css/media.css	(revision 39139)
+++ wp-admin/css/media.css	(working copy)
@@ -216,12 +216,36 @@
 	padding: 10px 0 10px 14px;
 }
 
-.media-item .error-div a.dismiss {
+.media-item .error-div button.dismiss {
+	color:  #0073aa;
 	display: block;
 	float: right;
 	margin: 0 10px 0 15px;
+	outline: 0;
+	text-decoration:  underline;
+	-webkit-transition-property: border, background, color; 
+	transition-property: border, background, color; 
+	-webkit-transition-duration: .05s; 
+	transition-duration: .05s; 
+	-webkit-transition-timing-function: ease-in-out; 
+	transition-timing-function: ease-in-out; 
 }
 
+.media-item .error-div button.dismiss:hover,
+.media-item .error-div button.dismiss:active {
+	color: #00a0d2; 
+}
+
+.media-item .error-div button.dismiss:focus {
+	color: #124964; 
+	-webkit-box-shadow: 
+		0 0 0 1px #5b9dd9, 
+		0 0 2px 1px rgba(30, 140, 190, .8); 
+	box-shadow: 
+		0 0 0 1px #5b9dd9, 
+		0 0 2px 1px rgba(30, 140, 190, .8); 
+}
+
 /*------------------------------------------------------------------------------
   14.1 - Media Library
 ------------------------------------------------------------------------------*/