<div class="card card-sleep border-dark mb-3"> <div class="card-header text-white bg-dark h4"> <i class="fa fa-bed pull-left" aria-hidden="true"></i> {% block header %}{% endblock %} </div> <div class="card-body text-dark"> <h4 class="card-title">{% block title %}{% endblock %}</h4> <div class="card-text">{% block content %}{% endblock %}</div> </div> <div class="card-footer text-muted"> {% block footer %}{% endblock %} </div> </div>