how to centre a html document code example

Example 1: align in the middle of page html

.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  /* bring your own prefixes */
  transform: translate(-50%, -50%);
}

Example 2: how to center text in html

text-align: center;

Example 3: how to center text in html

<p><center>YourText</center></p>