<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Mouseover and Mouseout Example</title>
<style>
#box {
width: 200px;
height: 200px;
background-color: lightblue;
}
#innerBox {
width: 100px;
height: 100px;
background-color: lightcoral;
margin: 50px;
}
</style>
</head>
<body>
<div id="box">
Hover over me!
<div id="innerBox"></div>
</div>
<script>
document.getElementById('box').addEventListener('mouseover', function() {
this.style.backgroundColor = 'cyan';
});
document.getElementById('box').addEventListener('mouseout', function() {
this.style.backgroundColor = 'lightblue';
});
</script>
</body>
</html>