Use the class mzp-t-click to call attention to some action the user should take.

<aside class="mzp-c-notification-bar mzp-t-click">
    <button class="mzp-c-notification-bar-button" type="button">Close notification</button>
    <p><a href="#" class="mzp-c-notification-bar-cta">Click this thing</a></p>
</aside>