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<div data-scroll-speed="3">

$(document).ready(function() {
  var boxes = $('[data-scroll-speed]'),
    $window = $(window);
  $window.on('scroll', function() {
    var scrollTop = $window.scrollTop();
    boxes.each(function() {
      var $this = $(this),
        scrollspeed = parseInt($this.data('scroll-speed')),
        val = -scrollTop / scrollspeed;
      $this.css('transform', 'translateY(' + val + 'px)');
    });
  });
})