如何使一个不定宽和不定高的元素垂直水平居中

绝对定位+translate

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body, html{
            width: 100%;
            height: 100%;
        }

        .container {
            width: 500px;
            height: 500px;
            background-color: aqua;
            position: relative;
        }

        .box {
            background-color: red;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="box">jkahgjahkjdghajkdgh</div>
    </div>
</body>
</html>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

弹性盒

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body, html{
            width: 100%;
            height: 100%;
        }

        .container {
            width: 500px;
            height: 500px;
            background-color: aqua;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .box {
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="box">jkahgjahkjdghajkdgh</div>
    </div>
</body>
</html>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

CSS Grid

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body, html{
            width: 100%;
            height: 100%;
        }

        .container {
            width: 500px;
            height: 500px;
            background-color: aqua;
            display: grid;
            justify-content: center;
            align-items: center;
        }

        .box {
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="box">jkahgjahkjdghajkdgh</div>
    </div>
</body>
</html>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

相关阅读:
数据结构与算法--其他算法
聊聊如何解决官方提供的onpremise项目安装sentry速度过慢问题
Python pathlib模块
什么是本质安全？
Comparable和Comparator的区别
Java文件操作
Unity ProBuilder（自己创建斜面、拐角）
李开复：我家的AI是坠吼的
linux-ARM下的数据库管理工具的安装使用（dbeaver）
本地PHP搭建简单Imagewheel私人云图床，在外远程访问

原文地址：https://blog.csdn.net/qq_40864647/article/details/125535475