fix bg file size

src/app/layout/layout.component.css

@@ -34,7 +34,7 @@
     width: 100%;
     height: 100%;
     background-size: auto 100%;
-    background-image: url("../../assets/img/background.png");
+    background-image: url("../../assets/img/background.jpg");
     background-repeat: no-repeat;
     background-position: center;
 }