lovecoding
/
web0331


			
				
					
						
						
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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>
    <!-- 
        px 像素
        rem => 1rem = 16px(跟字体大小)
        em 根据父元素
        vw 当前视口的宽度
        vh 当前视口的高度
    -->
    <style>
        * {
            margin: 0;
            padding: 0;
           font-size: 26px; 
        }
        #box {
            width: calc(50vw - 100px);
            height: 100vh;
            background: #00f;
            font-size: 14px;
        }
        p {
            font-size: 2em;
        }
    </style>
</head>
<body>
    <div id="box">
        <p>你好</p>
    </div>
</body>
</html>