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<html>
<head>
<style>
.testdiv {
  border: 5px outset red;
  background-color: gray;
  text-align: center;
  color: white;
}
</style>
</head>
<body>

<div class="testdiv">
  <h1>Tiêu đề 1</h1>
  <p>Hello world!</p>
</div>

</body>
</html>

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