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<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
  width: 500px;
  background-color: lightblue;
  overflow: auto;
}
</style>
</head>
<body>
<h1>Change max-height with JavaScript</h1>
<p>Click the "Try it" button to make sure that the DIV element's height never gets bigger than 100 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 exceed 100 pixels in height.</p>
</div>
<script>
function myFunction() {
  document.getElementById("myDIV").style.maxHeight = "100px";
}
</script>
</body>
</html>