diff --git a/static/js/app.js b/static/js/app.js
index 6f66951..93304c7 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -205,6 +205,16 @@ if (volNumEl) {
   volNumEl.addEventListener('click', function () { this.select(); });
 }
 
+const volSliderEl2 = document.getElementById('volume');
+const volWheelTarget = volSliderEl2 || volNumEl;
+if (volWheelTarget) {
+  volWheelTarget.addEventListener('wheel', function (e) {
+    e.preventDefault();
+    const current = parseInt(document.getElementById('volume').value, 10);
+    setVolume(current + (e.deltaY < 0 ? 4 : -4));
+  }, { passive: false });
+}
+
 // ---------------------------------------------------------------------------
 // SSE metadata
 // ---------------------------------------------------------------------------