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