zoukankan html css js c++ java

DIV 居中

<div class="container"></div>

div水平居中：设置margin的左右边距为自动
div水平居中
```
.container{
    margin:0 auto;
}
```

div垂直&水平居中：已知div宽高，利用div宽高一半的负margin

宽高一半负margin

.container{
    width: 150px;
    position: absolute;
    left: 50%;
    margin-left: -50px;
    border: 1px solid red;
}

div垂直&水平居中：利用transform

.container {
    position: absolute; left: 50%; top: 50%;
    transform: translate3d(-50%, -50%, 0);
}

div垂直&水平居中：利用嵌套div

嵌套div居中

<div class="container">
    <div class="sub-container"></div>
</div>

.container{
    width:200px;
    height:100px;
    position: absolute;
    top:50%;
    left:50%;
}
.sub-container{
    width:100%;
    height:100%;
    margin-top:-50%;
    margin-left:-50%;
}

postion结合margin:auto

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no,minimal-ui">
    <title></title>
    <style>
        * {
            padding:0;
            margin:0;
        }
        html,body {
            height:100%;
        }
        .demo {
            width:100px;
            height: 100px;
            text-align: center;
            line-height: 100px;
            background:lightblue;
        }
        .demo-1 {
            position: absolute;
            margin:0 auto;
            left:0;
            right:0;
        }
        .demo-2 {
            position: absolute;
            margin:auto 0;
            top:0;
            bottom:0;
        }
        .demo-3 {
            position: absolute;
            margin:auto;
            top:0;
            bottom:0;
            left:0;
            right:0;
        }
    </style>
</head>
<body>
    <div class="demo demo-1">水平居中</div>
    <div class="demo demo-2">垂直居中</div>
    <div class="demo demo-3">中心居中</div>
</body>
</html>

postion和translate 一起使用达到水平、垂直居中

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no,minimal-ui">
    <title></title>
    <style>
        * {
            padding:0;
            margin:0;
        }
        html,body {
            height:100%;
        }
        .demo {
            width:100px;
            height: 100px;
            text-align: center;
            line-height: 100px;
            background:peachpuff;
        }
        .demo-1 {
            position: absolute;
            left:50%;
            -webkit-transform:translateX(-50%);
        }
        .demo-2 {
            position: absolute;
            top:50%;
            -webkit-transform:translateY(-50%);
        }
        .demo-3 {
            position: absolute;
            top:50%;
            left:50%;
            -webkit-transform:translateX(-50%) translateY(-50%);
        }
    </style>
</head>
<body>
<div class="demo demo-1">水平居中</div>
<div class="demo demo-2">垂直居中</div>
<div class="demo demo-3">中心居中</div>
</body>
</html>

中心点偏移

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no,minimal-ui">
    <title></title>
    <style>
        * {
            padding:0;
            margin:0;
        }
        html,body {
            height:100%;
        }
        .demo {
            width:100px;
            height: 100px;
            text-align: center;
            background:lightblue;
        }
        .demo-1 {
            position: absolute;
            margin: 0 auto;
            left: -88px;
            right: 0;
        }
        .demo-2 {
            position: absolute;
            margin: auto 0;
            top: -30px;
            bottom: 0;
        }

        body:before {
            content: '';
            width: 100%;
            border-bottom: 2px dotted blue;
            position: absolute;
            top: 50%;
            -webkit-transform: translateY(-2px);
        }

        body:after {
            content: '';
            height: 100%;
            border-left: 2px dotted blue;
            position: absolute;
            left: 50%;
            -webkit-transform: translateX(2px);
        }

    </style>
</head>
<body>

<div class="demo demo-1">水平 距离偏移</div>
<div class="demo demo-2">垂直 距离偏移</div>

</body>
</html>

查看全文

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原文地址：https://www.cnblogs.com/blog-leo/p/4377362.html