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绝对居中.md

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定宽高

  1. 绝对定位+margin负值
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style>
        html,body{
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .container{
            width: 300px;
            height: 300px;
            background-color: blanchedalmond;
            position: relative;
        }
        .child{
            height: 100px;
            width: 100px;
            position: absolute;
            left: 50%;
            top:50%;
            margin-left: -50px;
            margin-top: -50px;
            background-color: lightcyan;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="child"></div>
    </div>
</body>
</html>
  1. 绝对定位+margin:auto
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style>
        html,body{
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .container{
            width: 300px;
            height: 300px;
            background-color: blanchedalmond;
            position: relative;
        }
        .child{
            height: 100px;
            width: 100px;
            position: absolute;
            left: 0;
            right: 0;
            top: 0;
            bottom: 0;
            margin: auto;
            background-color: lightcyan;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="child"></div>
    </div>
</body>
</html>

不定宽高

  1. transform: translate
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style>
        html,body{
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .container{
            width: 300px;
            height: 300px;
            background-color: blanchedalmond;
            position: relative;
        }
        .child{
            position: absolute;
            left: 50%;
            top:50%;
            transform: translate(-50%, -50%);
            background-color: lightcyan;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="child">child</div>
    </div>
</body>
</html>
  1. table布局
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style>
        html,body{
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .container{
            width: 300px;
            height: 300px;
            background-color: blanchedalmond;
            display: table-cell;
            vertical-align: middle;
            text-align: center;
        }
        .child{
            display: inline-block;
            background-color: aquamarine;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="child">child</div>
    </div>
</body>
</html>
  1. flex布局
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style>
        html,body{
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .container{
            width: 300px;
            height: 300px;
            background-color: blanchedalmond;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .child{
            background-color: aquamarine;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="child">child</div>
    </div>
</body>
</html>