diff --git a/skin/classic/treestyletab/metal/Darwin.css b/skin/classic/treestyletab/metal/Darwin.css
index 1d0dad8b..894461f6 100644
--- a/skin/classic/treestyletab/metal/Darwin.css
+++ b/skin/classic/treestyletab/metal/Darwin.css
@@ -5,8 +5,14 @@
 .tabbrowser-tabs[treestyletab-mode="vertical"]
   .tabbrowser-tab
   .tab-close-button {
-	padding-left: 0 !important;
-	padding-right: 0 !important;
+	padding: 0 !important;
+	margin-top: -1px !important;
+}
+
+.tabbrowser-tabs[treestyletab-mode="vertical"]
+  .tabs-newtab-button
+  .toolbarbutton-icon {
+	width: auto !important;
 }
 
 .tabbrowser-strip[treestyletab-mode="vertical"] {