CSS 实现元素垂直居中

[yyman001]

• 1 position:absolute

  //固定高宽
  .absolute{
  position: absolute;
  width: 200px;
  height: 200px;
  top: 50%;
  left: 50%;
  margin-top: -100px;
  margin-left: -100px;
  background: red
  }
  //非固定高宽
  .absolute2 {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  margin: auto; //关键
  background: red
  }

• 2 display:table-cell //居中内容在盒子里面 缺点:不能与float一起适用,会失效; 解决办法:再套多一个容器用float

  .table-cell{
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  width: 120px;
  height: 120px;
  background: purple;
  }

• 3 line-height 缺点:需要固定高,block,inline-block 元素

  .line-height {
  width: 120px;
  height: 120px;
  line-height: 120px;
  }

• 4 使用css3的新属性transform:translate(x,y)属性 缺点:不支持css3属性的浏览器不支持(IE)

  .translate {
  position: absolute;
  width: 80px;
  height: 80px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: green;
  }

• 5 伪类 缺点:需要多一个父容器元素

  .pseudo-class{
  position: fixed;
  display: block;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  text-align: center;
  background: rgba(0, 0, 0, .5);
  }
  .pseudo-class:before {
  content: '';
  display: inline-block;
  vertical-align: middle;
  height: 100%;
  }
  .pseudo-class .content {
  display: inline-block;
  vertical-align: middle;
  width: 60px;
  height: 60px;
  color: red;
  background: yellow;
  }