otp.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/2.1.2/sweetalert.min.js" integrity="sha512-AA1Bzp5Q0K1KanKKmvN/4d3IRKVlv9PYgwFPvm32nPO6QS8yH1HO7LbgB1pgiOxPtfeg5zEn2ba64MUcqJx6CA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
    <link rel="stylesheet" href="otp.css" />
  </head>
  <body>
    <div id="container">
      <h2>Enter OTP</h2>
      <p>Check your email for the OTP</p>
      <input id="input" type="text" placeholder="One Time Password" />
      <br />
      <button>Submit</button>
    </div>
  </body>
</html>
<script src="otp.js"></script>