center vertically with position absolute code example

Example 1: center image with position absolute

.wrapper img {
  left: 50%;
  transform: translate(-50%,0);
  position: absolute;
  z-index: 1 
}

Example 2: position absolute vertical center

<style>
.parent { position: relative; }
.centered-element {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
  
</style>

<div class="parent">
 <div class="centered-element">I'm Centered!</div>
</div>