diff --git a/adventskalender/2025/content/day01.html b/adventskalender/2025/content/day01.html
index 88505b6..201550e 100644
--- a/adventskalender/2025/content/day01.html
+++ b/adventskalender/2025/content/day01.html
@@ -2,12 +2,13 @@
     
   <!-- HEADER + BUTTONS -->
   <div class="popup-header">
-    <h2><🎁 1. Dezember – Der Anfang vom Zauber</h2>
+    <h2>🎁 1. Dezember – Der Anfang vom Zauber</h2>
 
     <div class="popup-tools">
       <button id="btn-font-toggle">Aa ↔ &#x1D49C;</button>
       <button id="btn-font-up">A+</button>
       <button id="btn-font-down">A−</button>
+      <button id="btn-audio-toggle" aria-label="Musik an/aus">🔊</button>
     </div>
   </div>
 
diff --git a/adventskalender/2025/js/popup.js b/adventskalender/2025/js/popup.js
index 31a9332..dc8a2d8 100644
--- a/adventskalender/2025/js/popup.js
+++ b/adventskalender/2025/js/popup.js
@@ -208,4 +208,21 @@ function initPopupTools() {
       applyScale();
     };
   }
+  // --- Musik an/aus ---
+  if (btnAudio && bgmusic) {
+    const updateIcon = () => {
+      btnAudio.textContent = bgmusic.paused ? "🔈" : "🔊";
+    };
+
+    updateIcon();
+
+    btnAudio.onclick = () => {
+      if (bgmusic.paused) {
+        bgmusic.play().catch(() => {});
+      } else {
+        bgmusic.pause();
+      }
+      updateIcon();
+    };
+  }
 }
\ No newline at end of file