iris/_examples/auth/auth/views/signin.html

<div class="user_signin">
    <form action="" method="post">
        <label for="username">Email:</label>
        <input name="username" type="email" />
        <label for="password">Password:</label>
        <input name="password" type="password" />
        <input type="submit" value="Sign in" />
    </form>
</div>