ghost-theme-sd.ai/partials/components/footer.hbs

<footer class="gh-footer{{#match @custom.header_and_footer_color "Accent color"}} has-accent-color{{/match}} gh-outer">
    <div class="gh-footer-inner gh-inner">

        <div class="gh-footer-bar">
            <span class="gh-footer-logo is-title">
                {{#if @site.logo}}
                    <img src="{{@site.logo}}" alt="{{@site.title}}">
                {{else}}
                    {{@site.title}}
                {{/if}}
            </span>
            <nav class="gh-footer-menu">
                {{navigation type="secondary"}}
            </nav>
            <div class="gh-footer-copyright">
                Powered by <a href="https://ghost.org/" target="_blank" rel="noopener">Ghost</a>
            </div>
        </div>

        <section class="gh-footer-signup">
            {{#if @custom.footer_signup_header}}
                <h2 class="gh-footer-signup-header is-title">
                    {{#if @custom.footer_signup_header}}
                        {{@custom.footer_signup_header}}
                    {{else}}
                        Subscribe to {{@site.title}}
                    {{/if}}
                </h2>
            {{/if}}
            {{#if @custom.footer_signup_subhead}}
                <p class="gh-footer-signup-subhead is-body">{{@custom.footer_signup_subhead}}</p>
            {{/if}}
            <button class="gh-button">Subscribe</button>
        </section>

    </div>
</footer>