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body { margin: 0 auto; padding: 0; } .header { padding: 20px 0; background-color: #333; } .nav { padding: 25px 0; background-color: slategrey; position: -webkit-sticky; top: 45px; z-index: 1; } .header, .nav { text-align: center; color: #fff; } .content { width: 600px; margin: 10px auto 100px; } .sticky { position: fixed; width: 100%; padding: 15px 0; left: 0; top: 0; z-index: 100; border-top: 0; -moz-transition: fadeIn .4s; -o-transition: fadeIn .4s; -webkit-transition: fadeIn .4s; transition: fadeIn .4s; }

$(document).ready(function() { // grab the initial top offset of the navigation var stickyNavTop = $('.nav').offset().top; // our function that decides weather the navigation bar should have "fixed" css position or not. var stickyNav = function(){ var scrollTop = $(window).scrollTop(); // our current vertical position from the top // if we've scrolled more than the navigation, change its position to fixed to stick to top, // otherwise change it back to relative if (scrollTop > stickyNavTop) { $('.nav').addClass('sticky visible'); } else { $('.nav').removeClass('sticky visible'); } }; stickyNav(); // and run it again every time you scroll $(window).scroll(function() { stickyNav(); }); });