水平垂直居中3

absolute + margin: auto;

by DarcyAn

HTML

<div class="parent">
<div class="child">
child
</div>
</div>

CSS

.parent {
  position: relative;
  background: pink;
  width: 300px;
  height: 300px;
}
.child {
  position: absolute;
  margin: auto;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding:10px;
  background: #eee;
  width: 80px;
  height: 80px;
  line-height: 80px;
}