diff --git a/src/browser/base/content/zen-styles/zen-decks.css b/src/browser/base/content/zen-styles/zen-decks.css
index 55cf99590..3effa4436 100644
--- a/src/browser/base/content/zen-styles/zen-decks.css
+++ b/src/browser/base/content/zen-styles/zen-decks.css
@@ -51,7 +51,7 @@
 
 #tabbrowser-tabbox:has(#tabbrowser-tabpanels[zen-split-view='true']) {
   --zen-split-row-gap: calc(var(--zen-element-separation) + 1px);
-  --zen-split-column-gap: calc(var(--zen-element-separation) + 1px);
+  --zen-split-column-gap: calc(var(--zen-element-separation)*3 + 1px);
   margin-right: calc(-1 * var(--zen-split-column-gap));
 
   :root[zen-right-side='true'] & {