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How TO - Slide Down a Bar on Scroll

Learn how to slide down a navigation bar on scroll with CSS and JavaScript.

How To Slide Down a Bar

Step 1) Add HTML:

Create a navigation bar:


<div id="navbar">
  <a href="#home">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>

Step 2) Add CSS:

Style the navigation bar:


#navbar {
    background-color: #333; /* Black background color */
    position: fixed; /* Make it stick/fixed */
    top: -50px; /* Hide the navbar 50 px outside of the top view */
    width: 100%; /* Full width */
    transition: top 0.3s; /* Transition effect when sliding down (and up) */

/* Style the navbar links */
#navbar a {
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 15px;
    text-decoration: none;

#navbar a:hover {
    background-color: #ddd;
    color: black;

Step 3) Add JavaScript:


// When the user scrolls down 20px from the top of the document, slide down the navbar
// When the user scrolls to the top of the page, slide up the navbar (50px out of the top view)
window.onscroll = function() {scrollFunction()};

function scrollFunction() {
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    document.getElementById("navbar") = "0";
  } else {
    document.getElementById("navbar") = "-50px";
Try it Yourself »