Login form dinámico HTML y CSS

<form action="#" method="post" class="login-form">

    <div class="form-title">Iniciar sesión</div>

    <input type="text" placeholder="Usuario" name="username" required />

    <input type="password" placeholder="Contraseña" name="password" required />

    <input type="submit" value="Ingresar" />

    <div class="form-message">Si aún no tienes una cuenta, <a href="#">Regístrate aquí</a>.</div>

</form>

<style>

.login-form {

    max-width: 300px;

    margin: 0 auto;

    padding: 20px;

    border: 1px solid #ccc;

    border-radius: 5px;

    background-color: #f2f2f2;

}

.login-form input[type="text"],

.login-form input[type="password"] {

    width: 100%;

    padding: 10px;

    margin: 5px 0;

    border: 1px solid #ccc;

    border-radius: 3px;

    box-sizing: border-box;

}

.login-form input[type="submit"] {

    width: 100%;

    background-color: #4CAF50;

    color: white;

    border: none;

    padding: 10px;

    border-radius: 3px;

    cursor: pointer;

}

.login-form input[type="submit"]:hover {

    background-color: #45a049;

}

.login-form .form-title {

    text-align: center;

    font-size: 24px;

    margin-bottom: 10px;

}

.login-form .form-message {

    text-align: center;

    margin-top: 10px;

    color: red;

}

</style>