margins of articles to be more center screen than full width added

templates/index.html

@@ -13,6 +13,7 @@
 {% endif %}
 
 {% for article in articles_page.object_list %}
+<div class="container">
 <article>
   <header>
     <h2><a href="{{ SITEURL }}/{{ article.url }}{% if not DISABLE_URL_HASH %}#{{ article.slug }}{% endif %}">{{ article.title }}</a></h2>
@@ -54,6 +55,7 @@
   <hr />
   {% endif %}
 </article>
+</div>
 {% endfor %}
 
 {% include "partial/pagination.html" %}