how to put the text in the middle in css code example

Example 1: css center text in div

/* For horizontal align: */
parent-element {text-align:center;}
/* For horizontal and vertical align: */
parent-element {position: relative;}
element-to-be-centered {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

/* See https://www.w3schools.com/css/css_align.asp for more info */

Example 2: 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>