* {
	margin:0;
	padding:0;
}
.zhiti {
	width:900px;
	height:1000px;
	margin:auto;
}
.kaishi {
	width:100px;
	height:30px;
	border:2px solid yellowgreen;
	text-align:center;
	line-height:30px;
	float:left;
	margin-left:300px;
}
.tingzhi {
	width:100px;
	height:30px;
	border:2px solid yellowgreen;
	text-align:center;
	line-height:30px;
	float:right;
	margin-right:300px;
	background:red;
}
ul li {
	list-style:none;
	width:50px;
	height:50px;
	background:greenyellow;
	float:left;
	text-align:center;
	line-height:50px;
	margin-top:40px;
	margin-left:44px;
}
.bot {
	width:300px;
	height:30px;
	border:3px solid silver;
	position:absolute;
	bottom:560px;
	left:550px;
}