I want to implement a sticky header on my website. Can you provide an example of how to do that using CSS and JavaScript?

Sure! A sticky header is a header that remains fixed to the top of the screen even as a user scrolls down a page. Here's an example of how you can create a sticky header using CSS and JavaScript: First, create your HTML header element: ``` <header> <h1>My Website</h1> <nav> <ul> <li><a href="#">Home</a></li> <li><a href="#">About</a></li> <li><a href="#">Contact</a></li> </ul> </nav> </header> ``` Next, add CSS to style the header and give it a fixed position: ``` header { position: fixed; top: 0; width: 100%; background-color: #fff; box-shadow: 0 4px 6px rgba(0,0,0,0.1); z-index: 999; } ``` This will make the header stay fixed at the top of the screen, and give it a white background with a drop shadow. Finally, use JavaScript to add a class to the header when the user scrolls down the page: ``` window.onscroll = function() {myFunction()}; var header = document.querySelector("header"); var sticky = header.offsetTop; function myFunction() { if (window.pageYOffset > sticky) { header.classList.add("sticky"); } else { header.classList.remove("sticky"); } } ``` This code will add the "sticky" class to the header element when the user has scrolled past its original position. You can style the "sticky" class in your CSS to change the appearance of the header when it's fixed. ``` header.sticky { position: fixed; top: 0; animation: slideDown .5s ease-in-out; } ``` This CSS will make the header stay fixed at the top of the screen, and use an animation to slide down when the user scrolls up. And that's it! With this code, you should have a sticky header that stays fixed to the top of the screen as the user scrolls down the page.