position

<!DOCTYPE html>
<html>
<head>
 <title>Absolute</title>
 <style type="text/css" media="screen">
  #box{
   width:300px;
   height:300px;
   background:blue;
   }
  #box2{
   width:50px;
   height:50px;
   background:yellow;
   }
 </style>
</head>
<body>
<div id="box">
 <div id="box2"></div>
</div>
</body>
</html>