Use the height property to set the height of an element. You can try to run the following code to set the height of a button with JavaScript −
Example
<!DOCTYPE html>
<html>
<body>
<h1>Heading 1</h1>
<p>This is Demo Text.</p>
<button type="button" id="myID" onclick="display()">Update Height</button>
<script>
function display() {
document.getElementById("myID").style.height = "100px";
}
</script>
</body>
</html>