xmpp.chapril.org-conversejs/src/templates/chatroom_password_form.html

<div class="chatroom-form-container">
    <form class="pure-form converse-form chatroom-form">
        <fieldset>
            <legend>{{heading}}</legend>
            <label>{{label_password}}</label>
            <input type="password" name="password"/>
            <input type="submit" value="{{label_submit}}"/>
        </fieldset>
    </form>
</div>