diff --git a/chrome/content/zotero-platform/mac/overlay.css b/chrome/content/zotero-platform/mac/overlay.css
index a905e4ea3b..a6682b49f3 100644
--- a/chrome/content/zotero-platform/mac/overlay.css
+++ b/chrome/content/zotero-platform/mac/overlay.css
@@ -112,11 +112,12 @@
 }
 
 #zotero-view-tabbox > tabs {
-	background: -moz-linear-gradient(top, #ffffff, #e0e0e0);
+	-moz-appearance: none;
+	background: -moz-linear-gradient(top, #ededed, #cccccc);
 	border-style: solid;
 	border-width: 0 0 1px 0;
 	border-color: #5e5e5e;
-	padding: 5px 0 4px 0;
+	padding: 2px 0 2px 0;
 }
 
 #zotero-view-tabbox > tabs > tab > hbox {