sticky-navigation.js

//CSS effect: -webkit-transition: all 0.4s ease; transition: all 0.4s ease; 

jQuery('h2:contains("KEY")').parent().attr('id', 'sticky-nav');

jQuery('head').append('<style>.sticky-nav {width: 100%;position: fixed;top: 0;background-color: #fff;text-align: center;}.sticky-nav > div {float: none; display: inline-block;}</style>');

jQuery(window).scroll(function() {
  if (jQuery(this).scrollTop() > 428 && $(this).scrollTop() < 3827){  
    jQuery('#sticky-nav').addClass('sticky-nav');
  } else{
    jQuery('#sticky-nav').removeClass('sticky-nav');
  }
});