how to align text in center of page css code example

Example: html css center text on page

<style>
body { background: white }
section {
  background: black;
  color: white;
  border-radius: 1em;
  padding: 1em;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%)
  }
</style>

<section>
  <h1>Nicely centered</h1>
  <p>This text block is vertically centered.
  <p>Horizontally, too, if the window is wide enough.
</section>