html tutorial - How to center align absolute positioned div using CSS - html5 - html code - html form
Answer: Use the CSS margin, left, right Property
CSS margin:It align the positioned <div> element and property that combination with the left and right position.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Center Alignment of Absolutely Positioned Elements</title>
<style type="text/css">
.box {
width: 50%;
position: absolute;
z-index: 99;
margin: 0 scroll;
left: 0;
right: 0;
padding: 20px;
background: #f0e68c;
}
</style>
</head>
<body>
<div class="box">
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
</div>
</body>
</html>