html5第八课时,灵活布局,flex

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<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title>灵活布局,flex</title>    <style>        #div1{            width: 400px;            height: 400px;            background-color: red;            display: flex;            justify-content: center;            align-items: center;        }        #div2{            width: 200px;            height: 200px;            background: yellow;        }    </style></head><body>    <div id="div1">        <div id="div2">        </div>    </div></body></html>
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