* {
			margin: 0;
			padding: 0;
  vertical-align:top
		}
		.box{border:1px solid #000;width: 800px; margin: 0 auto; }
		.box .fl{width: 48%;height: 400px;background:#ccc; display:inline-block}
		.box .fr{display:inline-block;width: 48%;background:#eee;height:400px}
		p{height: 100px;line-height: 100px;}
		a{position: fixed;top: 0;left: 0;}
.foot{background: #666;width: 800px;margin: 0 auto;line-height: 30px;}