vendure/packages/email-plugin/templates/partials/footer.hbs

<!--suppress ALL -->
<mj-section background-color="#375a67">
    <mj-column width="100%">
        <mj-text align="center" color="#eee">
            <span>[footer text]</span>
        </mj-text>
    </mj-column>
</mj-section>
</mj-body>
</mjml>