404.html

<!DOCTYPE HTML>
<html>
<head>
  <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
  <meta name="robots" content="all" />
  <meta name="robots" content="index,follow"/>
  <style>
    body {
      font-family: Arial, sans-serif;
      text-align: center;
      background-color: #f4f4f4;
      margin-top: 100px;
    }
    h1 {
      font-size: 100px;
      color: #ff0000;
    }
    p {
      font-size: 20px;
    }
    a {
      font-size: 18px;
      text-decoration: none;
      color: #0066cc;
    }
    a:hover {
      text-decoration: underline;
    }
  </style>
</head>
<body>

  <h1>404</h1>
  <p>Oops! The page you're looking for does not exist.</p>
  <p><a href="/">Back to Homepage</a></p>

</body>
</html>