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console 命令行工具 X clear

                    
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console
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=, initial-scale=">
	<meta http-equiv="X-UA-Compatible" content="">
	<title></title>
    <style>
        .fixed {
            position: fixed;
            height: 100vh;
            width: 100vw;
            background-color: #ccc;

            display: flex;
            align-items: center;
            justify-content: center;
        }

        img {
            width: 200px;
            height: 200px;
        }
    </style>
</head>
<body>
	<div class="fixed">
        <img src="https://gw.alicdn.com/imgextra/i2/O1CN01UUrssj210KLs0sOOj_!!6000000006922-2-tps-480-480.png" alt="">
    </div>
</body>
</html>