ninebox.html

<!DOCTYPE html>
<html>

<head>
    <title>CSS.1</title>
    <!--viewport+content让页面在移动端自适应宽度，可以按照设定的范围进行缩放-->
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" charset="utf-8">
    <link rel="stylesheet" href="nine.css">
</head>

<body>
    <div class="box">
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
    </div>
</body>

</html>