*{margin:0px;padding:0px;}
body{font-family:arial;font-size:25px;}
#wrapper{margin:50px auto;width:600px;height:600px;background:#5f5f5f;border:2px solid black;}
header{width:100%;height:80px;background:red;}
#content{width:100%;height:440px;}
footer{width:100%;height:80px;background:orange;}