lovecoding
/
VIP32


			
				
					
						
						
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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;
        }
        body {
            /* font-size: 10px; */
        }
        #box {
            width: 4rem;
            height: 4rem;
            background: #f00;
            font-size: 20px;
        }
        #box1 {
            width: calc(50vw - 100px);
            height: 50vh;
            /* width: 3em; */
            /* height: 3em; */
            background: #00f;
        }

        /* 
            单位：
                px 像素
                %  百分比
                rem 根元素大小 16px
                em  根据父元素的大小
                vh、vw 相对于整个视口 设备
                calc()
        */
    </style>
</head>
<body>
    <div id="box">
        <div id="box1"></div>
    </div>
    <script src="./rem.js"></script>
</body>
</html>