[FIX] article black bg

main/templates/main/includes/work_article_preview.html

 {% load wagtailimages_tags %}
 
-<div class="article-box {% if article.is_black %}dark-theme {% endif %}p-7 flex flex-col max-w-xl border border-grey-150 mb-8">
+<div class="article-box {% if article_page.is_black %}dark-theme {% endif %}p-7 flex flex-col max-w-xl border border-grey-150 mb-8">
   {% image article_page.image max-500x500 as image %}
   <a href="{{ article_page.url }}">
     <img