{% set item_col = show_sidebar ? 'col-12 col-md-9' : 'col-12' %} {% set sidebar_col = show_sidebar ? 'col-12 col-md-3' : 'col-12' %} <div class="row"> <div id="item" class="{{ item_col }} extra-spacing"> {% block item %}{% endblock %} </div> {% if show_sidebar %} <div id="sidebar" class="{{ sidebar_col }}"> {% block sidebar %}{% endblock %} </div> {% endif %} </div>