.banner{
    width: 100%;
}
.banner img{
    width: 100%;
    display: block;
}
.content{
    width: 1200px;
    margin: 0 auto;
}
.content .title{
    font-size:30px;
    font-family:Source Han Sans CN;
    font-weight:400;
    color:rgba(51,51,51,1);
    line-height:30px;
    margin-top: 60px;
    text-align: center;
}
.content .list{
    margin-top: 45px;
    display: inline-block;
    padding-bottom: 30px;
}
.content .list li{
    width: 280px;
    height: 300px;
    margin: 15px 26px 0 0;
    float: left;
    text-align: center;
    cursor: pointer;
}
.content .list li:hover .img_content{
    box-shadow:0px 0px 24px 0px rgba(39, 22, 23, 0.35);
}
.content .list li:nth-child(4n+0){
    margin-right: 0;
}
.content .list li .img_content{
    border: 1px solid #EEEEEE;
}
.content .list li .img{
    width: 260px;
    height: 230px;
    padding: 10px;
    line-height: 230px;
}
.content .list li .img img{
    max-width: 100%;
    max-height: 100%;
    vertical-align: middle;
}
.content .list li .certificate_name{
    font-size:18px;
    font-family:Source Han Sans CN;
    font-weight:400;
    color:rgba(51,51,51,1);
    line-height:18px;
    margin-top: 19px;
}
.content .empty{
    font-size:36px;
    font-family:Source Han Sans CN;
    font-weight:400;
    color:rgba(51,51,51,1);
    line-height:54px;
    margin-top: 200px;
    white-space: pre-line;
    text-align: center;
    padding-bottom: 400px;
}

.img_alert{
    display: none;
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
}
.img_alert .background{
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0.9;
}
.img_alert .prev{
    position: absolute;
    top: 50%;
    left: 250px;
    z-index: 110;
}
.img_alert .next{
    position: absolute;
    top: 50%;
    right: 250px;
    z-index: 110;
}
.img_alert .show_img{
    width: 700px;
    height: 700px;
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 109;
}
.img_alert .show_img>div{
    width: 700px;
    height: 700px;
    text-align: center;
    margin-top: -50%;
    margin-left: -50%;
    overflow: hidden;
    line-height: 700px;
}
.img_alert .show_img img{
    max-width: 700px;
    max-height: 700px;
    vertical-align: middle;
}
.img_alert .show_img .next_move{
    margin-left: 100%;
}
.img_alert .show_img .prev_move{
    margin-left: -200%;
}