diff --git a/wwwroot/js/ui.js b/wwwroot/js/ui.js
index a7c42da..76f76f6 100644
--- a/wwwroot/js/ui.js
+++ b/wwwroot/js/ui.js
@@ -52,7 +52,12 @@ function _addMarkButton(div, messageId, isMarked) {
       console.error('Mark toggle failed:', err);
     }
   });
-  div.appendChild(btn);
+  const replyBtn = div.querySelector('.msg-reply-btn');
+  if (replyBtn) {
+    replyBtn.after(btn);
+  } else {
+    div.prepend(btn);
+  }
 }
 
 // ── Reply Button ──