Align html element at the center of page vertically and horizontally

To align any element of HTML (div, image tag, links, paragraph tag, spans, etc) or nested elements at the middle of the page i.e. at the center both vertically and horizontally we need to use the following CSS attributes to the parent element.

   position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    text-align:center;
    width: 200px;
    height: 20px;
Example:
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.parent {
    color:#444444;
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    text-align:center;
    width: 200px;
    height: 20px;
}

</style>

</head>
<body>
<h1>HTML element at the middle of the page</h1>
<div class="parent">
    <h2>Hello world!!</h2>
</div>
</body>
</html> 

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