JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="child"></div>
</div>

CSS

.parent {
  position: relative;
  width: 200px;
  height: 100px;
  background: red;
  margin: 0 auto;
}

.child {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 60px;
  background: black;
}