How to pin a menu?

Question

CMS

How can I pin the menu so that it stays visible on top when swiping?
cosmofest.kvantorium48.ru

Answer 1

var navPos = $('#main-navigation').offset().top;
  $(window).scroll(function(){
    if ($(this).scrollTop()>=navPos) {
      $('#main-navigation').addClass('fixed');
    } else {
      $('#main-navigation').removeClass('fixed');
    }
  });

#main-navigation.fixed {
  position: fixed;
  top: 0; 
  left: 0; 
  right: 0; 
  z-index: 10; 
  margin-top: 0;
}