Remove "public" in the resource path

src/css/index.css

@@ -39,7 +39,7 @@ body {
 
 /* Portrait layout (default) */
 .app {
-    background:url(../../public/img/logo.png) no-repeat center top; /* 170px x 200px */
+    background:url(/img/logo.png) no-repeat center top; /* 170px x 200px */
     position:absolute;             /* position in the center of the screen */
     left:50%;
     top:50%;