de_quoi_parle_le_monde/templates/ui.html

{% macro logo(site_name) -%}
    {% set logo_info = logos_info[site_name] %}

    <span class="site_logo" style="background-color: {{ logo_info['background_color'] }};">
        {% if logo_info['content'] %}
            {{ logo_info['content'] | safe }}
        {% else %}
            <img src="{{ logo_info['src'] }}" />
        {% endif %}
    </span>
{%- endmacro %}