diff --git a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
index 046e46a1c..b31ecd18f 100644
--- a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
+++ b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
@@ -256,6 +256,7 @@
       width: 170px;
       border: none;
       padding-left: 2px;
+      animation: zen-sidebar-panel-animation-2 0.3s backwards;
     
       & .tab-label-container {
         display: block;