fallback.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <link
      rel="apple-touch-icon"
      sizes="180x180"
      href="./apple-touch-icon.png"
    />
    <link
      rel="icon"
      type="image/png"
      sizes="32x32"
      href="./favicon-32x32.png"
    />
    <link
      rel="icon"
      type="image/png"
      sizes="16x16"
      href="./favicon-16x16.png"
    />
    <link rel="manifest" href="./site.webmanifest" />
    <meta name="msapplication-TileColor" content="#da532c" />
    <meta name="theme-color" content="#ffffff" />
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Cat Intro</title>
  </head>
  <body>
    <h1 class="warning">
      OOPs! You are in offline mode! Page cannot be displayed
    </h1>

    <a href="./activities.html">Go back to home page</a>

    <script src="main.js"></script>
  </body>
</html>