What major mode in Emacs are you guys using when writing Selmer templates? The formatting gets all screwed up for me in web-mode:

#+begin_src html
     {% extends "base.html" %} {% block content %}
     <div class="content" >
       <div class="columns is-centered" >
         <div class="column is-two-thirds" >
           <!--Content -->
             </div>
             < /div>
             < /div>
     {% endblock %}
   #+end_src