实现垂直居中的方法(不知道居中块级元素的尺寸)

2019-02-28  本文已影响0人  腾_b422

1.方法一:使用绝对定位和transform

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .wrapper {
            position: relative;
            width: 500px;
            height: 500px;
            background-color: pink;
            text-align: center;
        }
        .box {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="box">盒子</div>
    </div>
</body>
</html>

2.使用 display 和 vertical-align 对容器里的文字进行垂直居中

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .wrapper {
            position: relative;
            width: 500px;
            height: 500px;
            background-color: pink;
            text-align: center;
            display: table;
        }
        .box {
            display: table-cell;
            vertical-align: middle;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="box">盒子</div>
    </div>
</body>
</html>

3.使用弹性布局的方式

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .wrapper {
            width: 500px;
            height: 500px;
            background-color: pink;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="box">盒子</div>
    </div>
</body>
</html>
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