index.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> Form Validation</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <form id="form">
            <h1>Register</h1>
            <div class="input-group">
                <label for="username">User Name</label>
                <input type="text" id="username" name="username">
                <div class="error"></div>
            </div>
            <div class="input-group">
                <label for="email">Email Address</label>
                <input type="text" id="email" name="email">
                <div class="error"></div>
            </div>
                <div class="input-group">
                    <label for="password">Password</label>
                    <input type="password" id="password" name="password">
                    <div class="error"></div>
                </div>

                    <div class="input-group">
                        <label for="cpassword">Confirm Password</label>
                        <input type="password" id="cpassword" name="cpassword">
                        <div class="error"></div>
                        </div>
               <button type="submit" id="form-btn">Register</button>
        </form>
    </div>
    <script src="main.js"></script>
</body>
</html>