.banner_top{
    
}
.banner_a{
    width: 50%;
    height: 400px;
    float: left;
    background-color: #ee4e47;
    display: flex;
}
.banner_a span{
    display:inline-block;
    font-size: 40px;
    color: #ffffff;
    margin: 20px 300px;
    
}
.banner_a .little{
    width: 80px;
    height: 3px;
    background-color: #ffffff;
    margin: 30px 300px;
    
}
.banner_a p{
    text-align: center;
    color: #000000;
    font-size: 24px;
    margin: auto;
    
}


.banner_b img{
    float: right;
    display: block;    
    width: 50%;
}

.banner_down{
    
}
.banner_c img{
    float:left;
    display: block;
    width: 50%;
}
.banner_d{
    float:right;
    height: 400px;
    width: 50%;
    background: #ee4e47;
    color: #000000;
    display: flex;

}
.banner_d p{
    text-align: center;
    font-size: 24px;
    margin: auto;
}
.banner_d .little{
    width: 100px;
    height: 3px;
    background-color: #ffffff;
    margin: 20px 300px;
    
}
.banner_d ul {
    font-size: 16px;
    margin: 11px 250px;
}
.banner_d ul li{
    list-style-type: disc;
}
.seach{
    margin: auto;
    background: url(../img/network/background1.png) no-repeat center;
    background-size: 1920px 660px;
    color: #000;
}

.seach h1{
    font-size: 40px;
    text-align: center;
}
.seach p{
    font-size: 16px;
    text-align: center;
}
.seach .seach_a {
    font-size: 16px;
    width: 300px;
    margin: 30px auto;
}
.seach .seach_a li{
    list-style-type:disc;
}
.seach .seach_b {
    width: 1200px;
    height: 100px;
    margin: auto;
}
.seach .seach_b li{
    float: left;
    margin: 0 20px;
}


.seachdown{
    margin: auto;
    background: url(../img/network/background2.jpg) no-repeat center;
    background-size: 1920px 660px;
    color: #fff;
}

.seachdown h1{
    font-size: 40px;
    text-align: center;
}
.seachdown p{
    font-size: 16px;
    text-align: center;
}
.seachdown .seach_a {
    font-size: 16px;
    width: 300px;
    margin: 0px auto 50px;
}
.seachdown .seach_a li{
    list-style-type:disc;
}
.seachdown .seach_b {
    width: 1200px;
    height: 100px;
    margin: auto;
}
.seachdown .seach_b li{
    float: left;
    margin: -30px 20px;
}
.icon{
    width: 1200px;
    height: 200px;
    margin: auto;
}
.icon p{
    text-align: center;
    font-size: 22px;
    color: #000000;
    margin: 30px 0px;
}
.icon ul li{
    float: left;
    margin: 0 30px;
}

.relation{
    margin:auto;
    background: url(../img/network/background3.jpg) no-repeat center;
    background-size:1920px 1000px;
    
}

.relation_a{
    width: 600px;
    height: 850px;
    margin:0px auto;
    
}
.relation_a img{
    padding: 30px 180px;
    background-color: #000000;
    margin: 20px 0 0 0;
}
.relation_a h2{
    font-size: 23px;
    text-align: center;
    font-weight:normal;
    color: #ffffff;
    background-color: #000000;
}
.relation form{
display: block;
background-color: #000000;

}
.relation form input:not([type="submit"]){
    width: 555px;
    height: 42px;
    border: 1px solid #a0a0a0;
    margin:16px 20px;
    font-size: 14px;
    color: #000; 
    line-height: 46px;
    text-indent: 10px;
}
.relation form textarea{
    width: 555px;
    height: 100px;
    border: 1px solid #a0a0a0;
    margin:16px 20px;
    font-size: 14px;
    color: #000; 
    line-height: 46px;
    text-indent: 10px;
}
.relation form input:last-of-type {
    width: 186px;
    height: 52px;
    background-color: #373B4D;
    font-size: 14px;
    color:#fff;
    margin: 0px 206px 20px 206px;
}