fix hf css

src/main/ui/static/css/hf_gateway.css

@@ -1,7 +1,7 @@
 .hf-gateway-background {
     width:100%;
     height:100%;
-    position: fixed;
+    /*position: fixed;*/
     background: url("img/hf_bg.jpg");
     top: 0;
     bottom: 0;