Update css/main.css

css/main.css

@@ -75,7 +75,7 @@ span[name="utterance"]:hover {
     cursor: pointer;
 }
 .uttPlaying {
-    background: blue; /* #FFF68F; */
+    background: #FFF68F;
     }
 em.linenumber { 
     display: inline-block;