JSFiddle - React, Tailwind, and code Playground

HTML

<p class="zentriert">zentriert<br /> :-)
</p>

CSS

* {
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
}
body {
  font-size: 150%;
  font-family: sans-serif;
  margin: 0 auto;
  min-height: 100%;
  height: 100%;
}

.zentriert {
  text-align: center;
  background-color: #A6F4FF;
  color: #464646;
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}