.clla{
clear:both;
}

.top{
width: 800px;
margin:auto;
}

.main{
width: 620px;
margin:auto;
float: right;
}


.lefta{
	float: left;
	width: 180px;
	text-align:center;
}

.left{
	float: left;
	width: 180px;
}

.right{
	float: right;
	width: 420px;
}