盒子居中

来源：9-9 外边距

到底是幼稚

2022-04-25 18:45:16

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>外边距</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
        }
        div{
            display: inline-block;
            width:200px;
            height: 200px;
            border: 1px solid red;
            background-color: salmon;
            /* 设置盒子居中 */
            margin:0 auto;
        }
    </style>
</head>
<body>
    <div id="s"></div>
</body>
</html>

margin：0 auto为什么不生效呢

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