Add wrapping content flow div

agaric/templates/layout/layout--onecol--node.html.twig

@@ -46,6 +46,7 @@
 
 <section class="section" data-headerbg="light">
   <div class="container">
+    <div class="flow content">
       {% if content.field_body_paragraph %}
         {% for i, paragraph in content.field_body_paragraph if i|first != '#' %}
           {% if i is not same as(title_paragraph_index) %}
@@ -83,6 +84,7 @@
           'field_services', 'uid', 'created'
          ) }}
     </div>
+  </div>
 </section>
 
 {% endif %}