Introduced base css files for plugins

Change-Id: Ia8f1bb671c6e770c19ce196f5161e48cf88b2b2a
diff --git a/dev/demo/plugin-client.html b/dev/demo/plugin-client.html
index 3cce6de..44333f8 100644
--- a/dev/demo/plugin-client.html
+++ b/dev/demo/plugin-client.html
@@ -3,7 +3,7 @@
   <head>
     <title>Plugin demo</title>
 
-    <link type="text/css" rel="stylesheet" href="/css/kalamar.css" />
+    <link type="text/css" rel="stylesheet" href="/css/kalamar-plugin.css" />
 
     <!-- load client javascript library -->
     <script src="/js/src/plugin/client.js" data-server="http://localhost:3003/"></script>
@@ -21,7 +21,7 @@
       }
     </style>
   </head>
-  <body style="background-color: yellow">
+  <body class="result-view">
     <h2>Example Widget!</h2>
     <script>
       function flood () {