how to align all the elements in html center using css code example

Example 1: how to center div

<!--center text-->
<!--padding deals with margins within the element itself-->
<!--margin deals with blank space surrounding and element-->
<!DOCTYPE html>
<html>
<head>
<style>
.center {
  margin: auto;
  width: 80%;
  border: 3px solid #73AD21;
  padding: 10px; 
  margin: 20px;
}
</style>
</head>
<body>

<h2>Center Align Elements</h2>
<p>To horizontally center a block element (like div), use margin: auto;</p>

<div class="center">
  <p><b>Note: </b>Using margin:auto will not work in IE8, unless a !DOCTYPE is declared.</p>
</div>

</body>
</html>

Example 2: how to align a component in the middle of page

div {
	width: 100px;
	height: 100px;
	background-color: red;
	
	position: absolute;
	top:0;
	bottom: 0;
	left: 0;
	right: 0;
  	
	margin: auto;
}

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Misc Example