居中布局技巧-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_52006046/article/details/127271305

效果图如下：

初始代码：

    <div class="father">
        <div class="son"></div>
    </div>

方法一：定位+margin边距挤到中中间

<!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>
        /* 1.定位+margin边距挤到中中间 */
        .father {
            position: relative;
            width: 400px;
            height: 400px;
            background-color: pink;
        }
        .son {
            position: absolute;
            left: 150px;
            top: 150px;
            width: 100px;
            height: 100px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="father">
        <div class="son"></div>
    </div>
</body>
</html>

方法二：定位+transform

<!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>
        /* 2.定位+transfrom */
        .father {
            position: relative;
            width: 400px;
            height: 400px;
            background-color: pink;
        }
        .son {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
            width: 100px;
            height: 100px;
            background-color: red;
        } 
    </style>
</head>

<body>
    <div class="father">
        <div class="son"></div>
    </div>
</body>
</html>

方法三：定位+方位名词

注意：

第一步：先要通过自绝父相让盒子脱离标准流

第二步：让子盒子的上下左右定位值为0

第三步：让子盒子的上下左右边距自适应

<!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>
        /* 3.定位+方位名词。*/
        .father {
            position: relative;
            width: 400px;
            height: 400px;
            background-color: pink;
        }
        .son {
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            right: 0;
            margin: auto;
            width: 100px;
            height: 100px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="father">
        <div class="son"></div>
    </div>
</body>
</html>

方法四：flex布局

最简的一种做法，比较推荐

<!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>

        /* 4.flex 布局 */
        .father {
            display: flex;
            justify-content: center;
            align-items: center;
            width: 400px;
            height: 400px;
            background-color: pink;
        }
        .son {
            width: 100px;
            height: 100px;
            background-color: red;
        } 
    </style>
</head>

<body>
    <div class="father">
        <div class="son"></div>
    </div>
</body>
</html>