diff --git a/src/browser/base/content/zen-styles/zen-tabs/horizontal-tabs.css b/src/browser/base/content/zen-styles/zen-tabs/horizontal-tabs.css
index 427ebeabf..29dcc61cb 100644
--- a/src/browser/base/content/zen-styles/zen-tabs/horizontal-tabs.css
+++ b/src/browser/base/content/zen-styles/zen-tabs/horizontal-tabs.css
@@ -9,7 +9,7 @@
         flex-direction: row !important;
         max-width: unset !important;
         min-width: unset !important;
-        width: 100%;
+        width: 100% !important;
         padding: var(--zen-toolbox-padding) !important;
     }