/* common css  */
*{margin:0;padding:0;outline:0;}
#box{margin:50% auto;width:800px;height:800px;}
ul li{list-style:none;padding-left:15px;}

header{width:100%;height:100px;background:#FF9999;}
/**   header    **/
#layout #header-left{background:pink;width:50%;height:100px;float:left;}
#layout #header-right{background:red;width:50%;height:100px;float:left;}
																										
#content{width:100%;height:600px;background:yellow;}
/**   content    **/
#layout #content-left{background:purple;width:70%;height:404px;float:left;}
#layout #content-right{background:pink;width:30%;height:600px;float:left;}

footer{width:100%;height:100px;background:green;}