Update index.html

index.html

@@ -556,8 +556,7 @@ function goFullscreen() {
   }
 
   function toggleSubtitleMenu() {
-    const subtitleSettings = document.querySelector('.subtitle-settings');
-    subtitleSettings.style.display = subtitleSettings.style.display === 'none' ? 'block' : 'none';
+    document.getElementById('subtitleToggle').checked ^= true;
   }
 
   // イベントリスナー