diff --git a/tanuki-sunset/index.html b/tanuki-sunset/index.html
index 5f520e24e..cc2a7a579 100644
--- a/tanuki-sunset/index.html
+++ b/tanuki-sunset/index.html
@@ -1,11 +1,30 @@
 <!DOCTYPE html>
 <html lang="en-us">
-  <head><script async src="https://arc.io/widget.min.js#VTeH6AEZ"></script>
+  <head>
     <meta charset="utf-8">
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>Unity WebGL Player | Tanuki Sunset</title>
     <link rel="shortcut icon" href="TemplateData/favicon.ico">
     <link rel="stylesheet" href="TemplateData/style.css">
+    <style>
+      /* Use CSS to make the game container fill the viewport */
+      body, html {
+        height: 100%;
+        margin: 0;
+        overflow: hidden;
+      }
+      #gameContainer {
+        width: 100%;
+        height: 100%;
+      }
+      .webgl-content {
+        width: 100%;
+        height: 100%;
+      }
+      .fullscreen {
+        display: none; /* Hide fullscreen button if necessary */
+      }
+    </style>
     <script src="TemplateData/UnityProgress.js"></script>
     <script src="Build/UnityLoader.js"></script>
     <script>
@@ -14,7 +33,7 @@
   </head>
   <body>
     <div class="webgl-content">
-      <div id="gameContainer" style="width: 960px; height: 600px"></div>
+      <div id="gameContainer"></div>
       <div class="footer">
         <div class="webgl-logo"></div>
         <div class="fullscreen" onclick="gameInstance.SetFullscreen(1)"></div>
