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<!DOCTYPE html>
<html>
<head>
<style>
.box {
width: 200px;
height: 200px;
background-color: #f1f1f1;
border: 1px solid #ddd;
padding: 20px;
}
</style>
</head>
<body>
<div class="box">
This is a box!
</div>
</body>
</html>