优雅黑色背景，屏幕上打印成功字样 - 简洁网页代码
<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: #000000;
color: #ffffff;
text-align: center;
font-family: Arial, sans-serif;
}
<p>.success-message {
font-size: 24px;
margin-top: 200px;
}
</style></p>
</head>
<body>
<div class="success-message">成功</div>
</body>
</html>
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