#div_center{
	width: 100%;
	height: 430px;
	background: #F5F5F5 ;
	margin-top: -20px;
	padding:35px 0;
}
#div_bg{
	background:url(../img/zm.jpg)  no-repeat center top;
	height: 408px;
}#div_bg .titm{
	line-height: 35px;
	padding: 35px 0;
	font-size: 16px;
	color: #666;
	text-align: center;
}
.persit{
	width: 1300px;
	height: 500px;
	padding: 20px 20px;
}
.persit li{
	position: relative;
	width: 364px;
	height: 248px;
	overflow: hidden;
	float: left;
	margin-left: 50px;
}
.simt-olt{
	display: block;
	width: 100%;
	height: 100%;
	background: url(../img/bg-col.png);
	position: absolute;
	left: 0;
	top: 208px;
	text-align: center;
	padding-top: 0;
	transition: all .5s linear;
}
.simt-olt dt{
	width: 364px;
	height: 0;
	opacity: 0.2;
	overflow: hidden;
	transition: all .5s linear 0s;
}
.simt-olt dd{
	color: #fff;
	font-size: 16px;
	font-family: "Microsoft YaHei";
	line-height: 40px;
}
.persit li:hover .simt-olt dt {
    height: 48px;
    opacity: 1;
    transition: all .5s linear 0.5s;
}
.persit li:hover .simt-olt{
	 top:0; 
	 padding-top:80px;
	  transition:all .5s linear;
}