css实现元素水平垂直居中常见的两种方式实例详解

一、父元素的flex布局实现元素的水平垂直居中

示例代码如下：

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <meta name="viewport" content="width=device-width, initial-scale=1.0">  <meta http-equiv="X-UA-Compatible" content="ie=edge">  <title>Document</title>  <style>    .parent{      display:flex;      display:-webkit-flex;      justify-content: center;      align-items: center;      width:100%;      height: 200px;      background-color: #c43;    }    .child{      width:300px;      height:100px;      background-color: #c4235b;    }  </style></head><body>  <div class="parent">    <div class="child"></div>  </div></body></html>

效果图如下：

二、绝对定位&负margin值实现元素水平垂直居中

注意：

元素本身需要确定宽度和高度

示例代码如下：

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <meta name="viewport" content="width=device-width, initial-scale=1.0">  <meta http-equiv="X-UA-Compatible" content="ie=edge">  <title>Document</title>  <style>    div{      width:300px;      height:100px;      background-color: #873cac;      position:absolute;      top:50%;      left:50%;      margin-left: -150px;      margin-top:-50px;    }    </style></head><body>  <div></div></body></html>