how to align all content in html center code example

Example 1: css center text

/* To center text, you need to use text-align. */

.centerText {
  text-align: center; /* This puts the text into the center of the 
  screen. */
}

/* There are also other things that you can use in text-align:
left, right, and justify. Left and right make the test align to the
right or left of the screen, while justify makes the text align both
sides by spreading out spaces between some words and squishing others. */

Example 2: centering horizontally

div.center{display:block;margin:auto;width:50%;}
p.center{text-align:center;}