                         <div class="col-sm-3">
                                <!-- para activarlo añadir clase "on" -->
                                <a href="#" role="buttom" id="filterContacts">
                                    <span class="fas fa-filter fa-lg"></span>
                                    <span class="sr-only">Filter contacts</span>
                                </a>
                                <span id="infoContacts">
                                    3.240 contacts