Update index.css

sandbox/index.css

@@ -218,6 +218,10 @@ a {
         background-color: #2c5a74; /* Add a hover color */    
     }
 
+    playBtn:active {
+        background-color: #162D3A; /* Add a hover color */
+    }
+
     #playBtn:focus {
         outline: none !important;
         border: none;