Try hard-coding GitHub Pages default base path

index.html

@@ -11,24 +11,24 @@
 
     <script>
       window.Polymer = {
-        rootPath: "/",
+        rootPath: "/des_ncsa/",
       };
       // Load and register pre-caching Service Worker
       // if ('serviceWorker' in navigator) {
       //   window.addEventListener('load', function() {
-      //     navigator.serviceWorker.register('./static/service-worker.js', {
-      //       scope: './static/',
+      //     navigator.serviceWorker.register('/des_ncsa/static/service-worker.js', {
+      //       scope: '/des_ncsa/static/',
       //     });
       //   });
       // }
     </script>
 
     <base href="/" />
     <!-- See https://goo.gl/OOhYW5 -->
-    <link rel="manifest" href="./static/manifest.json" />
+    <link rel="manifest" href="/des_ncsa/static/manifest.json" />
 
-    <script src="./static/bower_components/webcomponentsjs/webcomponents-loader.js"></script>
-    <link rel="import" href="./static/des_components/elements-built.html" />
+    <script src="/des_ncsa/static/bower_components/webcomponentsjs/webcomponents-loader.js"></script>
+    <link rel="import" href="/des_ncsa/static/des_components/elements-built.html" />
 
     <style>
       html {