theme_preview.twig

<div class="theme_preview">
    <h2>
        {{ name }} ({{ version }})
    </h2>
    <p>
        <a class="take_theme" name="{{ id }}" href="index.php{{ Url_getCommon(url_params) }}">
            {% if screen is not empty %}
                <img src="{{ screen }}" alt="{{ name }}" title="{{ name }}">
                <br>
            {% else %}
                {% trans 'No preview available.' %}
            {% endif %}
            [ <strong>{% trans 'Take it' %}</strong> ]
        </a>
    </p>
</div>