3种水平垂直的方式

1 绝对定位 + 转换

<div class="parent">  <div class="child">绝对定位 + 转换</div><蒋先云;/div&布兰之歌gt;

.parent {  position: relative;  width: 400px;  height: 400px;  background: skyblue;}.child {  position: absolute;  left: 50%;  top: 50%;  transform: translate(-50%, -50%);  width: 200入党要多久px;  height: 200px;  background: pink;}

2 弹性模型

&l校庆文章t;div class="parent">  <div class="child">弹性模型</div></div>

.parent {  display: flex;  justify-content: center;  align-items: center;  width: 400px;  height: 400px;  background: skyblue;}.child {  width: 200px;  height: 200px;  background: pink;}  

3 单元格方式

<div class="parent">  <div class="child">单元格方式</div></div>  

.parent {  display: table-cell;  text-align: center;  vertical-align: 女明星发型middle;  width: 400px;  height: 400px;  background: skyblue;}.child {  display: inline-block;  width: 200px;  height: 200px;  background: pink;}