How TO - Resize Header on Scroll

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Learn how to shrink a header on scroll with CSS and JavaScript.

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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: 0.2s; /* 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";
}
}

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