diff --git a/src/browser/base/content/zen-styles/zen-panel-ui.css b/src/browser/base/content/zen-styles/zen-panel-ui.css
index a6ac50c24..7938194e7 100644
--- a/src/browser/base/content/zen-styles/zen-panel-ui.css
+++ b/src/browser/base/content/zen-styles/zen-panel-ui.css
@@ -7,7 +7,7 @@ panel[type='arrow'][animate][animate='open']::part(content) {
   animation: zen-jello-animation 0.35s ease;
 
   @media (-moz-platform: macos) {
-    animation: zen-jello-animation-alt 0.15s ease;
+    animation: zen-jello-animation-alt 0.2s ease-out;
   }
 }