<!DOCTYPE html>
<html>
<head>
<style>
div {
background-color: green;
color: white;
padding: 25px;
text-align: center;
}
div:hover {
background-color: blue;
}
</style>
</head>
<body>
<p>Mouse over the div element below to change its background color:</p>
<div class="mouseover">Mouse Over Me</div>
</body>
</html>