diff --git a/content/treestyletab/treestyletab-tmp.css b/content/treestyletab/treestyletab-tmp.css
index d82db55a..34ab5013 100644
--- a/content/treestyletab/treestyletab-tmp.css
+++ b/content/treestyletab/treestyletab-tmp.css
@@ -23,3 +23,10 @@
   tabbrowser[treestyletab-mode="vertical"] tabs[flowing] > * .tabs-frame {
 	-moz-box-flex: 1 !important;
 }
+
+.tabbrowser-tab[pinned] > .tab-image-left,
+.tabbrowser-tab[pinned] > .tab-drag-indicator-left,
+.tabbrowser-tab[pinned] > .tab-drag-indicator-right,
+.tabbrowser-tab[pinned] > .tab-image-right {
+	display: none;
+}
diff --git a/content/treestyletab/treestyletab.css b/content/treestyletab/treestyletab.css
index 24544e94..ec3163eb 100644
--- a/content/treestyletab/treestyletab.css
+++ b/content/treestyletab/treestyletab.css
@@ -379,10 +379,11 @@ toolbar.treestyletab-tabbar-toolbar[treestyletab-mode="vertical"]
 
 .tabbrowser-tabs[treestyletab-mode="vertical"]
   .tabbrowser-tab[pinned="true"] {
-	position: fixed !important;
-	z-index: 100;
-	width: 24px;
 	height: 24px;
+	line-height: 0;
+	position: fixed !important;
+	width: 24px;
+	z-index: 100;
 }
 
 /* print preview */