Hides header when you scroll down and shows when you scroll back up. The animation is handled through CSS. You can simply use a transform to move the navigation off screen.

Header hide on scroll.js

function headerHide() {

  // Hide Header on scroll down
  var didScroll;
  var lastScrollTop = 0;
  var delta = 5;
  var navbarHeight = $('.header-global').outerHeight();

  $(window).scroll(function(event){
    didScroll = true;
  });

  setInterval(function() {
    if (didScroll) {
      hasScrolled();
      didScroll = false;
    }
  }, 250);

  function hasScrolled() {
    var st = $(this).scrollTop();

    // Make sure they scroll more than delta
    if(Math.abs(lastScrollTop - st) <= delta)
      return;

    // If they scrolled down and are past the navbar, add class .is-up
    // This is necessary so you never see what is "behind" the navbar.
    if (st > lastScrollTop && st > navbarHeight){
      // Scroll Down
      $('.header-global').removeClass('is-down').addClass('is-up');
    } else {
      // Scroll Up
      if(st + $(window).height() < $(document).height()) {
        $('.header-global').removeClass('is-up').addClass('is-down');
      }
    }

    lastScrollTop = st;
  }

}