<button class="button primary reveal-overlay-link" open-container-id="invite-user-popup">Open popup</button>
<div class="reveal-overlay" id="invite-user-popup">
    <div class="reveal">
        <header>
            <h1>Invite People to this Project</h1>
            <button class="close-button close" aria-label="Close reveal" type="button">
                <i class="i32 icon_close_popup"></i>
            </button>
        </header>
        <section>
        Popup content
        </section>
        <footer>
            <button class="button clear close">Cancel</button>
            <button class="button default">Invite</button>
        </footer>
    </div>
</div>