.content{overflow: hidden;padding-bottom:50px;margin-bottom:20px;}
.content_tit{margin-bottom:0;}

.book_div{padding-bottom:40px;overflow: visible !important;border-top:1px solid #cacaca !important;}
.book_div .swiper-container{}
.book_div .swiper-wrapper{margin-top:40px;}
.book_div .swiper-slide{overflow:hidden;}
.book_div .swiper-slide .pic{width:244px; height:176px;}
.book_div .swiper-slide .pic img{width:244px; height:176px;display: block;}
.book_div .swiper-pagination-bullet{border:1px solid #ccc;}
.book_div .swiper-pagination-bullet-active{background:#fff;}
.swiper-container-horizontal>.swiper-pagination-bullets, .swiper-pagination-custom, .swiper-pagination-fraction{bottom:-40px !important;}
.book_div .swiper-slide .zi{height:46px;line-height:46px;position:relative;}
.book_div .swiper-slide .icon_bg{width:224px; height:162px;background:rgba(0,0,0,0.5); position:absolute;top:0;left:0;padding:7px 10px;opacity:0;}
.book_div .swiper-slide .zi span{width:31px; height: 7px;display:block;background:url(../images/certificate_icon2.png) no-repeat; position:absolute;right:-40px;top:19px;}
.book_div .swiper-slide .zi cite{width:0; height: 1px;display:block;background:#a2a2a2; position:absolute;left:0;bottom:0;}

.book_btn{width: 6px;height:10px;top:0;}
.book_div .swiper-button-prev{left: auto; right:40px;background:url(../images/certificate_icon3.jpg) no-repeat;}
.book_div .swiper-button-next{background:url(../images/certificate_icon4.jpg) no-repeat;}

.book_div .swiper-slide .icon_div{width:224px; height:162px; background:url(../images/certificate_icon1.png) center center no-repeat;position: relative;}
.icon_div::before, .icon_div::after {box-sizing: border-box;content: '';position: absolute;width: 100%; height: 100%;}
.icon_div::before, .icon_div::after { top: 0;left: 0;height: 100%; width: 100%;-webkit-transform-origin: center;-ms-transform-origin: center; transform-origin: center;}
.icon_div::before {border-top: 2px solid #fff; border-bottom: 2px solid #fff;-webkit-transform: scale3d(0, 1, 1);transform: scale3d(0, 1, 1);}
.icon_div::after {border-left: 2px solid #fff;border-right: 2px solid #fff;-webkit-transform: scale3d(1, 0, 1); transform: scale3d(1, 0, 1);}
.icon_div:hover::before, .icon_div:hover::after {-webkit-transform: scale3d(1, 1, 1); transform: scale3d(1, 1, 1);-webkit-transition: -webkit-transform 0.5s; transition: transform 0.5s;}

.layer_box{background:rgba(0,0,0,0.7);width:100%;height:100%;position:fixed;top:0;left:0;z-index:999;display:none;}
.layer_div{width:488px; height:380px;position: absolute;top:50%;margin-top:-244px;left:50%;margin-left:-160px;z-index:1000;}
.close_div{color: #fff;font-size:24px;cursor: pointer;height:30px;line-height:30px;text-align: right;}
.layer_box .swiper-container{width:488px;height:350px;}
.layer_box .layer_swiper .swiper-slide{}
.layer_box .layer_swiper img{width:488px;height:350px;}