css align everything center 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: css center everything

/* to make "align-items: center" work: use "min-height: 100vh;"
100vh = 100% Viewport Height */
body {
	display: flex;
	min-height: 100vh;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}

Example 3: how to horizontal center a div in css

#inner {
  width: 50%;
  margin: 0 auto;
}