.banner {
    height: 480px;
    text-align: center;
}
.banner img {
    
   height: 100%;
}
.content {
    
 
    text-align: center;

}
.nav-main {
    width: 100%;
    
    height: 50px;
    background-color: #ccc;
}
.nav-main-top {
    position: relative;
}
.nav {
    position: absolute;
    left:50%;
    transform: translate(-50%);
  width: 600px;
padding: 0 40px;
   
}
.nav li {
    height: 50px;
  
    float: left;
    width: 200px;
    text-align: center;
   
    
    line-height: 50px;
    font-size: 16px;
    margin:0 40px;
    
}


.nav li a{
    color: #171717;
}

.nav .active a {
    color: #6790d5;
}

.synopsis .news-first-top ul li {
    border-bottom: 2px solid #ccc;
    padding-bottom: 20px;
    margin-top: 30px;
}
.synopsis .news-first-top ul li a {
    display: block;
}
.synopsis .news-first-top .cont-text {
    width: 828px;
    margin-right: 12px;
}

.synopsis .news-first-top .pic{
    width: 354px;
    border: 1px solid #ccc;
    padding: 2px;
    
}
.synopsis .news-first-top .pic img {
    width: 354px;
}
.synopsis .news-first-top .cont-text h3 {
    font-size: 20px;
}
.synopsis .news-first-top .cont-text h5 {
    font-size: 12px;
    margin-top: 20px;
    color: #ccc;
    padding-bottom: 20px;
    border-bottom: 1px dashed #ccc;
}
.synopsis .news-first-top .cont-text h4 {
    margin-top: 20px;
}