How TO - Resize Header on Scroll
Learn how to shrink a header on scroll with CSS and JavaScript.
How To Shrink a Header on Scroll
Step 1) Add HTML:
Create a header:
Example
<div id="header">Header</div>
Step 2) Add CSS:
Style the header:
Example
#header {
background-color: #f1f1f1; /* Grey background */
padding: 50px 10px; /* Some padding */
color: black;
text-align: center; /* Centered text */
font-size: 90px; /* Big font
size */
font-weight: bold;
position: fixed; /* Fixed
position - sit on top of the page */
top: 0;
width: 100%;
/* Full width */
transition: 0.4s; /* Add a transition effect (when
scrolling - and font size is decreased) */
}
Step 3) Add JavaScript:
Example
// When the user scrolls down 50px from the top of the document, resize the
header's font size
window.onscroll = function() {scrollFunction()};
function scrollFunction() {
if (document.body.scrollTop > 50 ||
document.documentElement.scrollTop > 50) {
document.getElementById("header").style.fontSize = "30px";
} else {
document.getElementById("header").style.fontSize = "90px";
}
}
Try it Yourself »
