margin auto

 <!DOCTYPE html>

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            height: 100vh;
        }
        #box{
            background: #22bf60;
            width: 200px;
            height: 200px;
            margin: 25% auto;
        }
    </style>
</head>
<body>
<div id="box">

</div>
</body>
</html>

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