diff --git a/modules/home/niri/config.kdl b/modules/home/niri/config.kdl
index ca6dec7..215dfb0 100644
--- a/modules/home/niri/config.kdl
+++ b/modules/home/niri/config.kdl
@@ -222,8 +222,7 @@ layout {
 
     // You can enable drop shadows for windows.
     shadow {
-        // Uncomment the next line to enable shadows.
-        // on
+        off
 
         // By default, the shadow draws only around its window, and not behind it.
         // Uncomment this setting to make the shadow draw behind its window.
@@ -333,6 +332,13 @@ window-rule {
     open-floating true
 }
 
+// Zen draws its own client-side shadow; clip it to Niri's square window geometry.
+window-rule {
+    match app-id=r#"^zen-beta$"#
+    geometry-corner-radius 0
+    clip-to-geometry true
+}
+
 // Example: block out two password managers from screen capture.
 // (This example rule is commented out with a "/-" in front.)
 /-window-rule {