<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.rectangle {
height: 50px;
width: 100px;
background-color: #555;
}
</style>
</head>
<body>
<h2>Rectangle CSS</h2>
<div class="rectangle"></div>
</body>
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</html>