diff --git a/wwwroot/js/ui.js b/wwwroot/js/ui.js
index b1b6d12..a7c42da 100644
--- a/wwwroot/js/ui.js
+++ b/wwwroot/js/ui.js
@@ -52,7 +52,7 @@ function _addMarkButton(div, messageId, isMarked) {
       console.error('Mark toggle failed:', err);
     }
   });
-  div.prepend(btn);
+  div.appendChild(btn);
 }
 
 // ── Reply Button ──