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<html lang="en">
<head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> #div0 { display: flex; }
#div0 div:first-child { background-color: aqua; flex: 0 0 50px }
#div0 div:nth-child(2) { background-color: blue; flex: 1 1 auto }
#div0 div:last-child { background-color: red; flex: 0 0 50px }
/* 媒体查询 */ @media (min-device-width: 400px) and (max-device-width: 500px) { #div0 div:nth-child(2) { background-color: yellowgreen; } }
@media (min-device-width: 501px) and (max-device-width: 600px) { #div0 div:nth-child(2) { background-color: pink; } } </style></head>
<body> <div id="div0"> <div>one</div> <div>two</div> <div>three</div> </div></body>
</html>
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