diff --git a/src/browser/base/content/zen-styles/zen-compact-mode.css b/src/browser/base/content/zen-styles/zen-compact-mode.css
index 69657753c..25b06edff 100644
--- a/src/browser/base/content/zen-styles/zen-compact-mode.css
+++ b/src/browser/base/content/zen-styles/zen-compact-mode.css
@@ -17,6 +17,10 @@
 
       #zen-appcontent-wrapper {
         margin-left: var(--zen-element-separation) !important;
+
+        & #tabbrowser-tabbox {
+          margin-left: 0 !important;
+        }
       }
 
       #zen-sidebar-top-buttons-customization-target {
diff --git a/src/browser/base/content/zen-styles/zen-decks.css b/src/browser/base/content/zen-styles/zen-decks.css
index d02a7b523..55cf99590 100644
--- a/src/browser/base/content/zen-styles/zen-decks.css
+++ b/src/browser/base/content/zen-styles/zen-decks.css
@@ -56,7 +56,7 @@
 
   :root[zen-right-side='true'] & {
     margin-right: 0;
-    margin-left: calc(-1 * var(--zen-split-column-gap));
+    margin-left: var(--zen-element-separation);
   }
 }