JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block"></div>

CSS

* {
  padding: 0;
  margin: 0;
}

/*Блочный элемент*/
.block {
  display: block;
  width: 400px;
  height: 80px;
  background: pink;
  transform: translate(-50%);
  position: relative;
  left: 50%;
}