body
{
 margin: 10px auto;
 width: 1300px;
 background-color:#CCC;
}

header,nav,section,aside,article,footer
{
 display: block;
}

header
{
 height: 200px;
 border: 1px solid green;
 width: 1300px;
}

nav
{
 float: left;
 height: 23px;
 border: px solid  #F00;
 width: 1300px;
}

section
{
 width: 1300px;
 height: 700px;
 border: 2px solid  #FFF;
}

aside
{
 float: left;
 margin: 2px;
 width: 300px;
 height: 635px;
 border: 1px solid #FFF;

}

article
{
 float: right;
 margin: 10px;
 width: 950px;
 height: 600px;

}

footer
{
 clear: both;
 width: 1300px;
 height: 20px;
 border: 1px solid #000;
}