<div>
  <img src="https://hsto.org/webt/60/b9/c0/60b9c07530d29066643618.png" width="256">
  <img id="over" src="https://clipart-best.com/img/rose/rose-clip-art-296.png">
</div>

#over {
  width: 80px;
  position: absolute;
  left: calc((256px - 80px) / 2);
  top: 105px;
}