Add the article class

src/_includes/main/article.njk

@@ -22,7 +22,7 @@ eleventyComputed:
         {% include "toc.njk" %}
     {% endif %}
 
-    <article>
+    <article class="article">
         {{ content | safe }}
     </article>
 </div>

src/assets/css/main.css

@@ -263,7 +263,7 @@ main {
 }
 
 .main__header,
-article,
+.article,
 .left-sidebar,
 .right-sidebar {
     background-color: var(--clr-content-bg);
@@ -296,7 +296,7 @@ article,
         grid-template-columns: minmax(0,15rem) minmax(0,2.5fr) minmax(0,15rem);
     }
 
-    article {
+    .article {
         grid-area: b;
     }