.prcont ul {overflow: hidden;width:1200px; }
.prcont li {float: left;width:300px; }
.prcont li:nth-child(3n){margin-right:0;}
.prcont li>a {display: block;width:300px;height:250px;position: relative;}
.prcont li>a img {display: block;}
.prcont li>a span {display: block;position: absolute;width:300px;height:250px;background: url(../tupian/ljgd.png) no-repeat center;top: 0;left: 0;display: none; text-align:center; color:#FFFFFF}
.prcont li>a title {top:200px;  text-align:center; color:#FF0000}

.prcont li p {text-align: center;margin-top: 130px;}
.prcont li p a {font-size: 16px;color:#666;}
.prcont li>a:hover span {display: block;}