body {background-color: lightgray;font-family: Arial, Helvetica, sans-serif;}
#container {width: 1100px;margin: 0px auto;border: 4px solid gray;}
header {background-color: red; height: 100px;width: 100%;text-align: center;line-height: 100px;color: antiquewhite;border-bottom: 2px solid black;}
 nav ul li{float:left;list-style: none; margin: 20px;line-height: 10px}
a {text-decoration:none;}
nav {background-color:lightgray;text-align:center;}
ul {text-align:center;display:inline-block;}
#content{float:left;width:850px;background-color:green;min-height:500px;padding:10px;}
.article{color:white;margin-top:15px}
*{padding:0px; margin:0px}
aside{float:left; width:210px; background-color:coral; min-height:500px;padding:10px}
footer{background-color:black; color:white; text-align: center; height: 30px; line-height:30px}
.clearfix{clear:both}