css 设置最小字体

用transform：scale 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            border: 5px solid #ccc;
            font-size: 100px;
            transform: scale(.1);
        }
    </style>
</head>
<body>
    <div class="box">极寒</div>
</body>
</html>

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