.act_nav{
	height: 102px;
	position: fixed;
	left: 0;
	bottom: 0;
	z-index: 500;
	width: 100%;
	background-repeat: no-repeat;
	background-position: center top;
}
.act_nav .event_content{height: 74px;width:985px; margin:0 auto; text-align:left; position:relative; }