feat(templates/base.html): enclose content block in padded div

kursy/templates/base.html

@@ -45,8 +45,10 @@
         {% include "header.html" %}
 
         {% block body %}
+            <div class="grow py-8 px-8">
               {% block content %}
               {% endblock content %}
+            </div>
         {% endblock body %}
 
         {# Global javascript #}