html,body{min-width:940px}#wrapper{width:840px;margin-left:auto;margin-right:auto}header{width:800px;margin-bottom:0;margin-left:auto;margin-right:auto}nav{width:720px;margin-top:10px;margin-left:auto;margin-right:auto}#main{width:720px;margin-left:auto;margin-right:auto}footer{width:720px;margin:1em auto 0}