diff --git a/waybar/style.css b/waybar/style.css
index 17b8d78..e7e2702 100644
--- a/waybar/style.css
+++ b/waybar/style.css
@@ -56,3 +56,13 @@ window#waybar {
 #temperature.critical {
   color: @tn-red;
 }
+
+#custom-tray-arrow {
+  padding: 0 12px;
+  color: @tn-fg-muted;
+  transition: transform 200ms ease;
+}
+
+#group-tray-drawer.expanded #custom-tray-arrow {
+  transform: rotate(180deg);
+}