JSFiddle - React, Tailwind, and code Playground

HTML

<div class="sem_transform"></div>
<div class="com_transform"></div>

CSS

.sem_transform {
  width: 40px;
  height: 40px;
  background: red;
  /* Dica */
  position: absolute;
  left: 50%;
  top: 50%;
}

.com_transform {
  width: 40px;
  height: 40px;
  background: blue;
  /* Dica */
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}