Update index.html

public/index.html

@@ -27,6 +27,7 @@
             font-family: Arial, sans-serif;
             margin: 20px;
             background-color: var(--bg-color);
+            text-align:center;
             color: var(--text-color);
         }
 
@@ -58,5 +59,6 @@
     <button id="fetchBtn">fetch!</button>
     <div id="output"></div>
     <script src="client.js"></script>
+    <p><a href="https://github.com/gigirassy/plaster">view our source code!</a> licensed under the public domain, so you can do whatever you want with it!</p>
 </body>
 </html>