JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
<div class="center">

</div>
</div>

CSS

.wrapper{
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.center{
  width: 20%;
  height: 50px;
  background: red;
}