lovecoding
/
web0715


			
				
					
						
						
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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>
    <link rel="stylesheet" media="screen and (max-width: 600px)" href="./css/a.css">
    <link rel="stylesheet" media="screen and (max-width: 900px) and (min-width: 800px)" href="./css/b.css">
    <style>
        .box{
            width: 200px;
            height: 200px;
            background-color: red;
        }
        @media screen and (max-width:500px) {
            .box{
                background-color: blue;
            }
        }
        @media screen and (max-width:600px) and (min-width:500px) {
            .box{
                background-color: yellow;
            }
        }

        /* 竖屏 */
        @media (orientation:portrait){
            .box{
                font-size: 50px;
                color: aqua;
            }
        }
        /* 横屏 */
        @media (orientation:landscape){
            .box{
                font-size: 60px;
                color: blueviolet;
            }
        }
    </style>
</head>
<body>
    <a href="https://www.runoob.com/cssref/css3-pr-mediaquery.html">文档</a>
    <div class="box">hello</div>
</body>
</html>