Fixed post width

source/_layouts/post.html.twig

@@ -1,7 +1,6 @@
-{% extends 'default.html.twig' %}
+{% extends 'default' %}
 
 {% block content_wrapper %}
-    <main class="col-md-9">
     {% include('post-header') %}
 
     {% block content %}{% endblock %}
@@ -45,6 +44,4 @@
             {% if page.previous_post %}<li>Previous post: <a href="{{ page.previous_post.url }}">{{ page.previous_post.title }}</a></li>{% endif %}
         </ul>
     {% endif %}
-
-    </main>
 {% endblock %}