单行代码实现垂直居中

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前不久css有一项更新,align-content 属性,无需创建弹性布局或网格布局,即可实现块级方向 (垂直方向)对齐。

align-content:center;

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .container {
            height: 600px;
            width: 600px;
            align-content: flex-start;
            background-color: #ccc;
        }
 
        .item {
            width: 50px;
            height: 50px;
            background: #333333;
            margin: 10px;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
</div>
 
</body>
</html>

效果就是下面看到的这样

image.png