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 68c7d8624..a5ca41b3f 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
@@ -368,7 +368,7 @@
 #zen-browser-tabs-wrapper {
   min-height: fit-content;
   overflow-y: auto;
-  overflow-x: clip;
+  overflow-x: clip !important; /* might break custom css with new design, so let's force it */
   height: 100%;
   scrollbar-width: thin;
   position: relative;