diff --git a/wp-admin/css/colors-classic.css b/wp-admin/css/colors-classic.css
index 0b5f55cbb..817122506 100644
--- a/wp-admin/css/colors-classic.css
+++ b/wp-admin/css/colors-classic.css
@@ -653,8 +653,7 @@ input.readonly, textarea.readonly {
 
 #update-nag, .plugin-update {
 	background-color: #fffeeb;
-	border-bottom-color: #ccc;
-	border-top-color: #ccc;
+	border-color: #ccc;
 	color: #555;
 }
 
diff --git a/wp-admin/css/colors-fresh.css b/wp-admin/css/colors-fresh.css
index eff946754..b47a187db 100644
--- a/wp-admin/css/colors-fresh.css
+++ b/wp-admin/css/colors-fresh.css
@@ -653,8 +653,7 @@ input.readonly, textarea.readonly {
 
 #update-nag, .plugin-update {
 	background-color: #fffeeb;
-	border-bottom-color: #ccc;
-	border-top-color: #ccc;
+	border-color: #ccc;
 	color: #555;
 }
 
diff --git a/wp-admin/wp-admin.css b/wp-admin/wp-admin.css
index 06bf3567d..b6dedaa06 100644
--- a/wp-admin/wp-admin.css
+++ b/wp-admin/wp-admin.css
@@ -755,10 +755,16 @@ td.media-icon img {
 	line-height: 29px;
 	font-size: 12px;
 	text-align: center;
-	border-bottom-width: 1px;
-	border-bottom-style: solid;
-	border-top-width: 1px;
-	border-top-style: solid;
+}
+
+#update-nag {
+	border-width: 1px 0;
+	border-style: solid none;
+}
+
+.plugin-update {
+	border-width: 0 0 1px;
+	border-style: none none solid;
 }
 
 #update-nag a,