add css-vars-ponyfill to demo page

index.html

@@ -49,6 +49,10 @@
             }
         </style>
 
+        <script src="https://unpkg.com/css-vars-ponyfill@1"></script>
+        <script>
+          cssVars({shadowDOM: true,watch: true});
+        </script>
         <!-- Web component polyfill loader -->
         <script src="https://unpkg.com/@webcomponents/webcomponentsjs@2.1.3/webcomponents-loader.js"></script>
 

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "build": "rollup -c",
     "watch": "rollup -c -w",
-    "serve": "live-server",
+    "serve": "live-server --port=4200",
     "start": "run-p watch serve",
     "prepare": "npm run build",
     "pages": "rm -rf demo && mkdir -p demo && cp -r dist demo/ && cp -r test demo/ && cp index.html demo/ && gh-pages -d demo --repo git@github.com:myuw-web-components/myuw-profile.git",