JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="child_1"></div>
  <div class="child_2"></div>
</div>

CSS

.parent {
  position: relative;
  left: 50%;
  transform: translate(-50%);
}

.child_1, .child_2  {
  display: inline-block;
  width: 100px;
  height: 80px;
  background: blue;
}