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

.nav-main {
    width: 100%;
    
    height: 50px;
    background-color: #ccc;
}
.nav-main-top {
    position: relative;
}
.nav {
    position: absolute;
    left:50%;
    transform: translate(-50%);
  width: 1000px;
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;
}

.content{
    padding-top: 50px;
}
.content .pic {
    
    text-align: center;
    margin-bottom: 30px;
}
.content-main {
    position: relative;
}

.text h4{
    position: relative;
    font-size: 20px;
    padding-bottom: 20px;
   
}
.text h4 a {
    position: absolute;
    left: 50%;
    transform: translate(-50%);
    width: 350px;
    border-bottom: 1px solid #ccc;
    text-align: center;
    padding-bottom: 10px;
}
.text p {
    margin-top: 40px;
    text-align: center;
    color: #171717;
    line-height: 32px;
    
}
.text .p-text {
    margin-bottom: 20px;
}
.marin-h {
    margin-top: 20px;
}