写一个html网页打开居中、放大显示一个红色的helloWord
<!DOCTYPE html>
<html>
<head>
<title>Hello World</title>
<style>
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
h1 {
color: red;
font-size: 6em;
text-align: center;
}
</style>
</head>
<body>
<h1>Hello World</h1>
</body>
</html>
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