html如何使一个盒子水平垂直居中

方法一：利用定位（常用方法，推荐）

    <style>
        div {
            width: 100px;
            height: 100px;
            border: 1px solid #999;
            position: absolute;
            top: 50%;
            left: 50%;
            margin-top: -50px;
            margin-left: -50px;
            
        }
    </style>

方法二：利用 margin:auto;

  div {
            width: 100px;
            height: 100px;
            border: 1px solid #999;
            position: absolute;
            margin: auto;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;


        }

方法三：利用 display:table-cell

<!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>
        .parent {
            width: 500px;
            height: 500px;
            border: 1px solid #000;
            display: table-cell;
            vertical-align: middle;
            text-align: center;//文字居中
        }

        .child {
            width: 100px;
            height: 100px;
            line-height: 100px; //给line-height让文字居中
            border: 1px solid #999;
            display: inline-block;
        }
    </style>
</head>

<body>
    <div class="parent">
        <div class="child">我是子元素</div>
    </div>
</b

方法四：利用 display：flex;设置垂直水平都居中

<!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>
        .parent {
            width: 500px;
            height: 500px;
            border: 1px solid #000;
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
        }

        .child {
            width: 100px;
            height: 100px;
            line-height: 100px;
            border: 1px solid #999;

        }
    </style>
</head>

<body>
    <div class="parent">
        <div class="child">我是子元素</div>
    </div>
</body>


</html>

方法五：计算父盒子与子盒子的空间距离(这跟方法一是一个道理需要已知高度、宽度)

       .parent {
            width: 500px;
            height: 500px;
            border: 1px solid #000;
        }

        .child {
            width: 100px;
            height: 100px;
            border: 1px solid #999;
            margin-top: 200px;
            margin-left: 200px;


        }

方法六：利用 transform （原理跟方法一一样，不同的是这个可以不需要知道盒子高宽）

<!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>
        .parent {
            width: 500px;
            height: 500px;
            border: 2px solid #000;
            position: relative;

        }

        .child {
            width: 100px;
            height: 100px;
            border: 2px solid palevioletred;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }
    </style>
</head>

<body>
    <div class="parent">
        <div class="child">我是子元素</div>
    </div>
</body>


</html>

html如何使一个盒子水平垂直居中

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