#container {
width: 900px;
margin: 0 auto;
padding: 0;
}

#content {
background-color: #ffffff;
padding: 0;
margin: 0 230px 0 230px;
}

#left {
float: left;
width: 229px;
margin: 0;
padding: 0;
border-left:1px solid #D4D4D4;
}

#right {
float: right;
width: 229px;
margin: 0;
padding: 0;
border-right:1px solid #D4D4D4;
} 

#header, #footer {
width: 900px;
}