CSS揭秘，切图

.center-display .object{
  position: absolute;
  width: 0.5em;
  height: 0.5em;
  top: 0;
  bottom: 0.8em;
  left: 0;
  right: 0;
  margin: auto auto;
  border-radius: 50%;
  background-color: red;
text-indent: -300em;
}
.center-display:nth-child(2) .object{
  bottom: 0;
}

居中和偏上一点点的代码，你能看出哪个是真真的放在中心吗？

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