元素绝对居中实例

CSS

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.hxxDesignMainfest-box {
  position: relative;
  top: 50%;
  margin-top: -72px;
  text-align: center;
}

.hxxDesignMainfest {
  width: 144px;
  height: 144px;
  position: relative;
  left: 50%;
  background-size: 100% 100%;
  margin-left: -72px;
}

.hxxDesignMainfest-txt {
  display: inline-block;
  color: #999;
  font-size: 16px;
}

Debugging

https://static.hexingxing.cn/v2/example/css.element.absolutely.centered.html