diff --git a/face.js b/face.js
index 7c2a957..072256c 100644
--- a/face.js
+++ b/face.js
@@ -21,6 +21,12 @@
     console.log(`X: ${e.clientX}, Y: ${e.clientY}, wid:${wid}, hig:${hig}`);
     left.style.transform = `rotate(${left_dir}deg)`;
     right.style.transform = `rotate(${right_dir}deg)`;
+    //デバッグ用
+    const dot = document.getElementById("dot");
+    var dot_top = hig/4+hig/100*11
+    var dot_left = wid/2-hig/4+hig/200*7
+    dot.style.top = `${dot_top}px`
+    dot.style.left = `${dot_left}px`
   });
 }
 update(); // 初回の表示更新（読み込み直後）