Newsletter Signup

This component contains a newsletter signup and is normally half of a row.

<section class="newsletter-block">

    <h3>Want to keep up to date?</h3>

    <p>Get involved with our private mailing list.</p>

    <form class="flex-input">
        <input type="email" placeholder="Email">
        <button type="submit">Join</button>
    </form>

</section>