lovecoding
/
vipAllDay


			
				
					
						
						
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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;
        }
        #box {
            width: 1rem;
            /* width: 200px; */
            /* height: 300px; */
            /* height: 10vh; */
            height: calc(500px - 10vh);
            background: #00f;
            color: red;
            font-size: 16px;
        }
        .aa {
            width: 100px;
            height: 2%;
            background: #ff0;
        }
        p {
            color:#fff;
            font-size: 1em;
            /* font-size: 20px; */
            /* text-indent: 2em; */
            
        }
        /* 
            单位
            px 像素
            %  百分比
            rem 根字体 1rem = 16px
            em  根据父级字体大小决定
            viewport
            vw : width  视口宽度
            vh:  height 视口高度
            calc()
        */
    </style>
</head>
<body>
    <div id="box">
        父级
        <p>
            哈哈哈哈
        </p>
        <div class="aa"></div>
    </div>
    <script src="./rem.js"></script>
</body>
</html>