<style>html { ?? ??: calc(100vw / 3.75) }
body { ?? ??: 0.16rem }</style>
<div class="box">hello php .cn</div>
/* ??? ???? ?? ? ????? 200px ?? 12.5rem ???. ?? 16PX? ???? ?????. */
<style> .box { /* 200px * 50px */ width: 2rem; height: 0.5rem; border: 1px background-color: lightgreen }< ;/???>
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![[? ?????] Node.js ?? ??](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
