Use prose for web standards articles

Author: RoyalIcing

lib/components_guide_web/templates/web_standards/index.html.eex

@@ -1,9 +1,5 @@
 <%= render view_module(@conn), "_header.html" %>
 
-<article>
-  <div class="text-white bg-gray-900">
-    <div class="content max-w-4xl mx-auto py-8 text-xl" style="--link-decoration: underline;">
-      <%= render(view_module(@conn), @article <> ".html", conn: @conn) %>
-    </div>
-  </div>
+<article class="prose md:prose-xl prose-invert max-w-4xl mx-auto py-16">
+  <%= render(view_module(@conn), @article <> ".html", conn: @conn) %>
 </article>