​x
 
<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        .box {
            width: 100px;
            height: 100px;
            background-color: red;
            transition: background-color 0.5s ease-in-out;
        }
​
        .box:hover {
            background-color: blue;
        }
    </style>
</head>
<body>
    <div class="box"></div>
​
    <script>
        // JavaScript can be used to add more complex animations and effects based on user interactions.
    </script>
</body>
</html>