scroll navigation

/*scroll navigation*/
$('.scroll').on('click', function(e) {
  e.preventDefault();
  var section = $(this).attr('href').substr($(this).attr('href').indexOf('#'));
  var $section = $(section);

  $('html, body').animate({
    scrollTop: $section.offset().top-90
  }, 1000);
 
});



//html 
<div class="menu">				
  <ul>
    <li><a href="#section-scroll-1" class="scroll">О конференции</a></li>
    <li><a href="#section-scroll-2" class="scroll">Расписание</a></li>
    <li><a href="#section-scroll-3" class="scroll">Спикеры</a></li>
    <li><a href="#section-scroll-4" class="scroll">Цены</a></li>
    <li><a href="#section-scroll-5" class="scroll">FAQ</a></li>
  </ul>
</div>