A dark theme is available with the mzp-t-dark theme class. This example omits any description.

<section class="mzp-c-call-out mzp-t-dark">
    <div class="mzp-l-content">
        <h2 class="mzp-c-call-out-title">A Headline With 30 Characters</h2>
        <p><a class="mzp-c-button mzp-t-dark" href="#">Call to Action</a></p>
    </div>
</section>