Fix CSS for Virtual Collection Builder
diff --git a/dev/demo/vc.html b/dev/demo/vc.html
index 9eb7648..bc8c340 100644
--- a/dev/demo/vc.html
+++ b/dev/demo/vc.html
@@ -21,6 +21,8 @@
   padding: 1em;
   font-family: mono;
 }
+
+
     </style>
   </head>
   <body>