<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {
width: 500px;
background-color: lightblue;
overflow: auto;
}
</style>
</head>
<body>
<h1>Change min-height with JavaScript</h1>
<p>Click the "Try it" button to make sure that the DIV element's height never becomes less than 400 pixels:</p>
<button onclick="myFunction()">Try it</button>
<div id="myDIV">
<p>This DIV element does not have a pre-defined height.</p>
<p>The height of this DIV element depends on its content.</p>
<p>But if you click the "Try it" button, yo will make sure that this DIV element does not become less than 400 pixels in height.</p>
</div>
<script>
function myFunction() {
document.getElementById("myDIV").style.minHeight = "400px";
}
</script>
</body>
</html>