diff --git a/src/browser/base/content/zen-styles/zen-browser-container.css b/src/browser/base/content/zen-styles/zen-browser-container.css
index 94f9869d1..95c7753fb 100644
--- a/src/browser/base/content/zen-styles/zen-browser-container.css
+++ b/src/browser/base/content/zen-styles/zen-browser-container.css
@@ -11,6 +11,10 @@
 
     box-shadow: var(--uc-tweak-rounded-corners-shadow) !important;
 
+    & browser {
+      background: white;
+    }
+
     /* Use pseudo element overlay to simulate rounded corners, similar to the
      * tab corners, fixes bug with backdrop-filter. */
     &::after {