.nav_background {}

.nav_background .banner {
    position: relative;
    width: 100%;
}
#main {
    padding: 0 50px;
  }
.nav_background .banner img {
    width: 100%;
}

.nav_background .banner span {
    position: absolute;
    top: 184px;
    width: 280px;
    height: 122px;
    left: 170px;
    background: rgba(238,238,238,0.5);
    font-size: 45px;
    color: #fff;
    text-align: center;
    line-height: 122px;
    font-weight: 700;
    font-family: '楷体';
}
.news-tab .am-tab-panel .news-list>li:before {
    display: none;
}
.news-tab .am-tab-panel .news-list>li {
    float: left;
    width: 31.66%;
    height: 230px;
    margin-right: 2.5%;
    border: none;
    margin-bottom: 25px;
}
.news-tab .am-tab-panel .news-list>li:nth-child(3n+3) {
    margin-right: 0;
}
.news-tab .am-tab-panel .news-list>li:nth-of-type(5n+6) {
    padding-top: 13px;
    padding: 0;
}
.news-tab .am-tab-panel .news-list>li:nth-last-of-type(1) {border-bottom: none;padding-bottom: 0;}
.news-tab .am-tab-panel .news-list>li:nth-of-type(5n+5) {border-bottom: none;padding-bottom: 0;}
.news-tab .am-tab-panel ul.am-list>li>a {
    width: 100%;
    height: 100%;
    padding: 0;
}

.news-tab .am-tab-panel ul.am-list>li>a img {
    width: 100%;
    height: 85%;
}

.news-tab .am-tab-panel ul.am-list>li>a p {
    position: relative;
    text-align: center;
    margin: 0;
    margin-top: 10px;
    font-size: 13.33px;
}

@media (max-width:1200px){
    .nav_background .banner span {
    top: 8px;
    left: 23px;
    width: 140px;
    height: 61px;
    font-size: 30px;
    line-height: 61px;
}
    #main {
    padding: 0 10px;
}
    .news-tab .am-tab-panel .news-list>li {
    width: 49%;
    margin-right: 1%;
    height: 116px;
    margin-bottom: 10px;
}
    .news-tab .am-tab-panel ul.am-list>li>a p {
    margin-top: 0px;
}
}