how to center a div on a pagein css code example

Example 1: css align center

//HTML
<div class="parent">
	<span>Hello World</span>
</div>

//CSS
.parent {
  display: flex;
  justify-content: center;
  align-items: center;
}

Example 2: how center div in css

.shadoww .prt {
    margin: 0 auto;
}