1. index.html (Create Account Page)
<!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">
    <link href="https://fonts.googleapis.com/css?family=Roboto:400,700" rel="stylesheet">
    <title>Create Account - Sign Up Form</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="signup-form">
        <form action="confirmation.html" method="POST">
            <h2>Create Account</h2>
            <p class="lead">It's free and hardly takes more than 30 seconds.</p>
            
            <div class="form-group">
                <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-user"></i></span>
                    <input type="text" class="form-control" name="username" placeholder="Enter username" required />
                </div>
            </div>
            <div class="form-group">
                <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-paper-plane"></i></span>
                    <input type="email" class="form-control" name="email" placeholder="Enter email" required />
                </div>
            </div>
            <div class="form-group">
                <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-lock"></i></span>
                    <input type="password" class="form-control" name="password" placeholder="Enter password" required />
                </div>
            </div>
            <div class="form-group">
                <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-check"></i></span>
                    <input type="password" class="form-control" name="confirm_password" placeholder="Confirm password" required />
                </div>
            </div>
            <div class="form-group">
                <button type="submit" class="btn btn-primary btn-block btn-lg">Sign Up</button>
            </div>
            <p class="small text-center">By clicking the Sign Up button, you agree to our 
                <br><a href="#">Terms & Conditions</a>, and <a href="#">Privacy Policy</a>.
            </p>
        </form>
        <div class="text-center">Already have an Account? <a href="login.html">Login here.</a></div>
    </div>
</body>
</html>
2. login.html (Login Page)
<!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">
    <link href="https://fonts.googleapis.com/css?family=Roboto:400,700" rel="stylesheet">
    <title>Login - Sign In Form</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="signup-form">
        <form action="confirmation.html" method="POST">
            <h2>Login to Your Account</h2>
            <p class="lead">It's quick and easy.</p>
            
            <div class="form-group">
                <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-paper-plane"></i></span>
                    <input type="email" class="form-control" name="email" placeholder="Enter email" required />
                </div>
            </div>
            <div class="form-group">
                <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-lock"></i></span>
                    <input type="password" class="form-control" name="password" placeholder="Enter password" required />
                </div>
            </div>
            <div class="form-group">
                <button type="submit" class="btn btn-primary btn-block btn-lg">Sign In</button>
            </div>
            <p class="small text-center">By clicking the Sign In button, you agree to our 
                <br><a href="#">Terms & Conditions</a>, and <a href="#">Privacy Policy</a>.
            </p>
        </form>
        <div class="text-center">Don't have an Account? <a href="index.html">Create Account</a></div>
    </div>
</body>
</html>
3. confirmation.html (Confirmation Page)
<!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">
    <link href="https://fonts.googleapis.com/css?family=Roboto:400,700" rel="stylesheet">
    <title>Confirmation</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="text-center">
        <i class="icon-box"><span class="glyphicon glyphicon-ok"></span></i>
        <h1>Confirmation</h1>
        <p>Form submitted successfully. This is just for testing; no data has been saved.</p>
    </div>
</body>
</html>
4. styles.css (CSS File)
body {
    color: #999;
    background: #f5f5f5;
    font-family: 'Roboto', sans-serif;
}
.form-control, .form-control:focus, .input-group-addon {
    border-color: #e1e1e1;
    border-radius: 0;
}
.signup-form {
    width: 390px;
    margin: 0 auto;
    padding: 30px 0;
}
.signup-form h2 {
    color: #636363;
    margin: 0 0 15px;
    text-align: center;
}
.signup-form .lead {
    font-size: 14px;
    margin-bottom: 30px;
    text-align: center;
}
.signup-form form {
    border-radius: 1px;
    margin-bottom: 15px;
    background: #fff;
    border: 1px solid #f3f3f3;
    box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.3);
    padding: 30px;
}
.signup-form .form-group {
    margin-bottom: 20px;
}
.signup-form .form-control {
    min-height: 38px;
    box-shadow: none !important;
    border-width: 0 0 1px 0;
}
.signup-form .input-group-addon {
    max-width: 42px;
    text-align: center;
    background: none;
    border-width: 0 0 1px 0;
    padding-left: 5px;
}
.signup-form .btn {
    font-size: 16px;
    font-weight: bold;
    background: #19aa8d;
    border-radius: 1px;
    border: none;
    min-width: 140px;
    outline: none !important;
    box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.3);
}
.signup-form .btn:hover, .signup-form .btn:focus {
    background: #179b81;
}
.signup-form a {
    color: #19aa8d;
    text-decoration: none;
}
.signup-form a:hover {
    text-decoration: underline;
}
.signup-form .fa {
    font-size: 21px;
}
input:focus,
textarea:focus {
    box-shadow: none !important;
    border-bottom: 3px solid #19aa8d !important;
    outline-width: 0;
    font-weight: 400;
}
This structure organizes the pages as follows:
- 
index.html: The Create Account form page.
 - 
login.html: The Login page.
 - 
confirmation.html: A confirmation page is displayed after submitting the form.
 - 
styles.css: The CSS file containing the styling for the pages.
 


