JSFiddle - React, Tailwind, and code Playground

HTML

<div class="first"></div>
<div class="second"></div>

CSS

.first{

}
.second{
  position: absolute;	
  width: 100px;	
  height: 100px;
  left: 50%;
  top: 50%;
  margin-top: -50px;
  margin-left: -50px;	
  background-color: #00c;
}