Ghost/ghost/admin/app/templates/settings/design/change-theme.hbs

<section class="gh-canvas">
    <GhCanvasHeader class="gh-canvas-header">
        <h2 class="gh-canvas-title" data-test-screen-title>All themes</h2>
        <section class="view-actions">
            <button type="button" class="mr4 gh-btn" {{on "click" this.toggleAdvanced}}><span>Advanced</span></button>
            <button type="button" class="gh-btn gh-btn-black" {{on "click" this.themeManagement.upload}}><span>Upload theme</span></button>
        </section>
    </GhCanvasHeader>

    <section class="view-container">
        {{#if this.showAdvanced}}
            <div class="gh-themes-container">
                <GhThemeTableLabs @themes={{this.themes}} />
            </div>
        {{/if}}

        <div class="gh-theme-directory-container">
            <div class="theme-directory">
                {{#each this.marketplaceThemes as |theme|}}
                    <a class="td-item" href={{theme.url}} target="_blank" rel="noopener noreferrer">
                        <div class="td-item-screenshot relative">
                            <img style="object-fit:contain;" src={{theme.image}} alt="{{theme.name}} Theme" />
                            <div class="td-item-overlay">
                                <LinkTo class="td-item-action gh-btn gh-btn-black mb4" @route="settings.theme.install" @query={{hash source="github" ref=theme.ref}}><span>Install</span></LinkTo>
                                <a href={{theme.previewUrl}} class="td-item-action gh-btn" target="_blank" rel="noopener"><span>Preview</span></a>
                            </div>
                        </div>
                        <div class="td-item-desc">
                            <div>{{theme.name}}</div>
                            <span>• {{theme.category}}</span>
                        </div>
                    </a>
                {{/each}}
            </div>
        </div>
    </section>
</section>