JSFiddle - React, Tailwind, and code Playground

HTML

<div parent id="parent">
  <div class="divtagABS">
  </div>  
</div>

CSS

#parent {
  position: relative;
  background: black;
  width: 600px;
  height: 400px;
}
.divtagABS {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 100px;
    background: white;
    width: 20%;
    height: 20%;
 }