lovecoding
/
VIP26


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        html,body {
            /* font-size: 10px; */
        }
        #box {
            width: 300px;
            height: 300px;
            background: #f00;
            /* font-size: 20px; */
        }
        /* 
            单位：
            px 像素
            rem 根元素大小 16px
            em  根据父级元素大小调整
            vh vw 相对于视口 设备
            %  百分比 
            calc()
        */
        #box1 {
            width: calc(50vw - 100px);
            height: 1rem;
            background: #ff0;
        }
    </style>
</head>
<body>
    <div id="box">
        <div id="box1"></div>
    </div>
    <script src="../rem.js"></script>
</body>
</html>