I am attempting to layout a site:

<http://kenzshop.com/Brandon/index>

I cannot get the main content area (blue colored)to align correctly.

The header (red) has a fluid with, the sidebar (yellow) has a fluid height, the main content area should be fluid width and height, but I cannot figure out how to get it to align correctly. 

It should align width-wise with the header.

Can anyone see what my issue is?

HTML:

```
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<title>Title of document</title>
<meta http-equiv="Content-Type" content="text/xhtml; charset=utf-8"></meta>
<meta http-equiv="Content-Type" content="text/css; charset=utf-8"></meta>
<link rel="stylesheet" href="style.css" type="text/css" />
</head>

<body>
   <div id="header"></div>
   <div id="main"><!--<iframe src="http://www.cnn.com/"/> --></div>
   <div id="sidebar"></div>
</body>

</html>

```

CSS:

```
body {
   margin:0;
   padding:0;
   height:100%; 
}

#header{
   height: 80px;
   border: 1px solid black;
   padding: 5px;
   margin-top: 5px;
   margin-left: 5px;
   margin-right: 5px;
   background-color:red;
}

#main{
   position:absolute;
   left:0;
   top:90px;
   right: 263px;
   padding:0;
   margin-top: 12px;
   margin-left: 5px;
   margin-bottom:5px;
   height:99% !important; /* works only if parent container is assigned a height value */
   width:100%;
   border:1px solid black;
   background-color:blue;
}

iframe{
   margin: 5px;
   display:block; 
   width:100%!important; 
   height:100%!important;
}

#sidebar{
   position:absolute;
   right:0;
   top:102px;
   padding:0;
   margin-right:5px;
   margin-bottom:5px;
   width:250px;
   height:99%; /* works only if parent container is assigned a height value */
   border:1px solid black;
   background-color:yellow;
}

```

![instructions](https://i.stack.imgur.com/vkEPM.png)