1. 引入 flexible.js cdn
```
<script src="http://g.tbcdn.cn/mtb/lib-flexible/0.3.4/??flexible_css.js,flexible.js"></script>
```
2. 更改 meta
```
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
```
3. 下載 cssrem，設置 1rem = 75px;
4. `ctrl+shift+p`快捷鍵 remcss 更改全局單位\
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[參考](https://github.com/amfe/article/issues/17)
