Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>layOut_01</title>

<style type="text/css">
*{margin:0px;padding:0px}
.pd5{padding:5px}
</style>

</head>
<body class="pd5">
<div style="background:green">
  <div style="float:left;background:yellow">left</div> 
  <div style="float:right;background:pink">right</div>
</div>

</body>
</html>
The code above is at http://dot.kr/x-test/layOut/001.php .
I can see the yellow backgound in the left and pink background in the right.
But where can I the background color:green ?

If I want to see the background color:green, I can I see it?