Redesign widget

Change-Id: I4a05fb056bb3a615ac4a5f6c33bdb018be8b5a95
diff --git a/templates/main.html b/templates/main.html
index 0b6ff9d..7c707c9 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -5,7 +5,10 @@
     <script data-server="{{ .korapServer }}" src="https://korap.ids-mannheim.de/instance/test/js/korap-plugin-latest.js"></script>
   </head>
   <body>
-    <p id="buy">...</p>
+    <h1>External Provider</h1>
+    <section>
+      <p id="buy">...</p>
+    </section>
     <script defer=""><!--
       "use strict";