JSFiddle - React, Tailwind, and code Playground

HTML

<div class="flex-container">
  <div class="flex-item">
    Hello world
  </div>
</div>

CSS

.flex-container {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: center;
  align-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  background-color: yellow;
}

.flex-item {
  order: 0;
  flex: 0 0 auto;
  align-self: auto;
  background-color: blue;
}