使绝对下拉元素居中

.parent {
  position: relative;
}

.child {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.parent {
  display: flex;
  align-items: center;
  justify-content: center;
}

.child {
  position: absolute;
}

.parent {
  position: relative;
}

.child {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -50px; /* 元素高度的一半 */
  margin-left: -50px; /* 元素宽度的一半 */
}