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css - 为何flex的align-items: center无法垂直居中？
PHP中文网
PHP中文网 2017-04-17 15:17:19
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参看语法规则完成练习，我只能水平居中，无法垂直居中，是少设置了什么吗？
我想实现的是在位置高度的情况下实现居中，这样可以用到flex吗？

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .box1{
            width: 400px;
            height: 200px;
            background: #ccc;
            position: relative;
        }
        .leftCircle{
            position: absolute;
            left: 0;
            top: 0;
            background: #fc0;
            width: 50px;
            height:50px;
            -webkit-border-radius:0 0 50px 0;
            -moz-border-radius:0 0 50px 0;
            border-radius:0 0 50px 0;
        }
        .rightCircle{
            position: absolute;
            right: 0;
            bottom: 0;
            background: #fc0;
            width: 50px;
            height:50px;
            -webkit-border-radius:50px 0 0 0;
            -moz-border-radius:50px 0 0 0;
            border-radius:50px 0 0 0;
        }
        body{
            display: flex;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
<p class="box1">
    <p class="leftCircle"></p>
    <p class="rightCircle"></p>
</p>
</body>
</html>
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迷茫
迷茫2017-04-17 15:19:19 1 floor

Give the body a height so that it can be vertically centered

  html,body,.box1{
            display: flex;
            justify-content: center;
            align-items: center;
            height:100%;
        }
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