diff --git a/public/index.html b/public/index.html
index 6652c7dd60ad34f6d80148f3c8e6876702d19854..900b235e8aa68154fe29cef0b23cf4034a2bd93e 100644
--- a/public/index.html
+++ b/public/index.html
@@ -1,23 +1,41 @@
 <!DOCTYPE html>
-<html>
-  <head>
-    <meta charset="utf-8">
-    <meta name="generator" content="GitLab Pages">
-    <title>Plain HTML site using GitLab Pages</title>
-    <link rel="stylesheet" href="style.css">
-  </head>
-  <body>
-    <div class="navbar">
-      <a href="https://pages.gitlab.io/plain-html/">Plain HTML Example</a>
-      <a href="https://gitlab.com/pages/plain-html/">Repository</a>
-      <a href="https://gitlab.com/pages/">Other Examples</a>
-    </div>
+<html><head>
+ <meta charset="utf-8" />
+ <title>landing QOTO.org</title>
+ <script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
+ <script src="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
+ <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css" />
+ <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/katex.min.css" />
+ <script defer src="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/katex.min.js"></script>
+ <script defer src="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/contrib/auto-render.min.js"
+   onload="renderMathInElement(document.body);"></script>
+ <link rel="stylesheet" href="style.css" />
+</head>
 
-    <h1>Hello World!</h1>
+<body>
+<div data-role="page" data-theme="a" style="background-color:#ffffcc;">
+<div data-role="header" data-position="fixed">
+ <div data-role="navbar"><ul>
+  <li><a href="https://qoto.org/" data-prefetch="true">QOTO.org</a></li>
+  <li><a href="https://discourse.qoto.org/" data-prefetch="true">Discourse</a></li>
+  <li><a href="https://cloud.qoto.org/" data-prefetch="true">NextCloud</a></li>
+  <li><a href="https://git.qoto.org/qoto/qoto" data-prefetch="true">GITLAB</a></li>
+ </ul></div>
+</div>
 
-    <p>
-      This is a simple plain-HTML website on GitLab Pages, without any fancy static site generator.
-    </p>
-  </body>
-</html>
+<div data-role="content">
+ <h2 style="text-align:center;">Hello \(\LaTeX\) World for landing <a href="https://qoto.org/about/more" data-prefetch="true">QOTO.org RULES</a>.</h2>
+</div>
+
+<div data-role="footer" data-position="fixed" style="overflow:hidden;">
+ <h4 style="text-align:right;">For example, there is my account etc...</h4>
+ <div data-role="navbar"><ul>
+  <li><a href="https://qoto.org/@puzzl" data-prefetch="true">@puzzl</a></li>
+  <li><a href="https://pages.gitlab.io/plain-html/">Plain HTML Example</a></li>
+  <li><a href="https://gitlab.com/pages/plain-html/">Repository</a></li>
+  <li><a href="https://gitlab.com/pages/">Other Examples</a></li>
+ </ul></div>
+</div>
+</div>
+</body></html>