CSS Layout How to - Align tall div block tag to center

Question

We would like to know how to align tall div block tag to center.

Answer


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
html, body {<!--   www . ja v a2 s  . co  m-->
  width: 100%;
  height: 100%;
  background-color: #AAA;
}

.one {
  width: 50%;
  position: relative;
  border: solid red thin;
  background-color: #EEE;
  margin: 0 auto;
  height: 100%;
}
</style>
</head>
<body>
  <div class="one"></div>
</body>
</html>

The code above is rendered as follows: