Update static/app.css

static/app.css

@@ -178,3 +178,12 @@ em {
     margin: -5px 0 6px 0;  /* slight overlap toward input */
     opacity: 0.9;
 }
+.audio-toggle {
+    margin-left: 10px;
+    cursor: pointer;
+    color: #007BFF;
+}
+
+.audio-toggle:hover {
+    color: #0056b3;
+}