rem 和 vw布局```html 开学季有礼，好货五折起 ``` ![rem vwz.png](https://p3-

<!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 user-scaleable=no maximum-scale=1 minimum-scale=1" />
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        html {
            font-size: 10px;
        }
        
        div.header {
            width: 75.0rem;
            height: 12.6rem;
            background-color: #e12e31;
            display: flex;
            align-items: center;
            justify-content: space-evenly;
        }
        
        img.scan,
        img.msg {
            width: 6.4rem;
            height: 6.4rem;
        }
        
        img.search {
            width: 4.0rem;
            margin: 0 2.0rem;
        }
        
        img.search {
            width: 8.0rem;
            height: 7.2rem;
        }
        
        div.search {
            display: flex;
            align-items: center;
            height: 8.0rem;
            background-color: #fff;
            border-radius: 8.0rem;
            font-size: 2.6rem;
            color: gray;
        }
    </style>
    <script>
        function setHtmlFontSize() {
            // 1.获取窗口尺寸
            const clientWidth = document.documentElement.clientWidth || window.innerWidth || document.documentElement.getBoundingClientRect().width
                // 2.计算HTml的字体大小
            const setHtmlFontSize = clientWidth / 75 + 'px'
                // 3.修改HTML的字体大小
            document.documentElement.style.fontSize = setHtmlFontSize
        }

        window.onresize = setHtmlFontSize
    </script>
</head>

<body>
    <div class="header">
        <img src="https://markdown-1253389072.cos.ap-nanjing.myqcloud.com/202112101716240.png" alt="" class="scan" />
        <div class="search">
            <img src="https://markdown-1253389072.cos.ap-nanjing.myqcloud.com/202112101716142.png" alt="" class="search" /> 开学季有礼，好货五折起
        </div>
        <img src="https://markdown-1253389072.cos.ap-nanjing.myqcloud.com/202112101716927.png" alt="" class="msg" />
    </div>
</body>

</html>
rem vwz.png