HTML/CSS - OTPLess Online Editor and JavaScript Compiler

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">
  <link rel="stylesheet" href="index.css">
  <title>OtpLess Login</title>
  <script src="https://otpless.com/auth.js"></script>
</head>
<body>
  <div id="main-container">
    <!-- Login Container -->
    <div id="otpless-container">
      <h1>Welcome to <span class="highlight">OtpLess</span></h1>
      <p>Login quickly and securely using your WhatsApp!</p>
      <div id="otpless" class="button"></div>
    </div>
    
    <!-- Success Message Container -->
    <div id="success-container" class="hidden">
      <h2>🎉 You're logged in!</h2>
      <p>Welcome <strong>without OTP</strong>, directly through your phone.</p>
      <div id="user-details"></div>
      <button class="logout-btn" onclick="logout()">Logout</button>
    </div>
  </div>

css

/* General Reset */
body, h1, h2, p, button {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Arial', sans-serif;
    background:  #fff;
    color:  #000;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
#main-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}
#otpless-container, #success-container {
    text-align: center;
    padding: 30px;
    border: 2px solid  #009d88;
    border-radius: 10px;

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