.box{
    background-color: #F6F7FA;
}
.nav{
    width: 100%;
    height: 312px;
    background: url(../../images/top_pic@2x.png) no-repeat;
        background-size: cover;
}
.banner{
    margin-top: 75px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #F6F7FA;
  
 
}
.top{
    text-align: center;
    margin-bottom: 57px;
}
.top p{
    font-size: 26px;
    font-family: Source Han Sans CN;
    font-weight: 400;
    color: #1A1A1A;
}
.top h3{
    font-size: 32px;
    font-family: Source Han Sans CN;
    font-weight: bold;
    color: #1A1A1A;
}
.top .text{
    font-size: 14px;
font-family: Source Han Sans CN;
font-weight: 400;
color: #1A1A1A;
opacity: 0.53;
}
.center{
    width: 894px;
    height: 206px;
    position: relative;
    margin-bottom: 55px;
}
.center img{
    width: 100%;
    height: 100%;
}
.dh{
    position: absolute;
    top: 56px;
    left: 133px;
}
.dh h4{
    font-size: 30px;
font-family: Microsoft YaHei;
font-weight: bold;
color: #FFFFFF;
}

.yx{
    position: absolute;
    top: 56px;
    right: 54px;

}
.yx h4{
    font-size: 24px;
    font-family: Microsoft YaHei;
    font-weight: bold;
    color: #191919;
}
.yx p,.dh p{
    font-size: 19px;
    font-family: Source Han Sans CN;
    font-weight: 500;
    color: #000000;
    margin-bottom: 33px;
}
.bottom{
    width: 1157px;
    height: 1014px;
    background: url(../../images/pic@2x.png) no-repeat;
        background-size: cover;
}
.beranhao{
    padding-top: 43px;
    padding-bottom: 39px;
    background-color: #F6F7FA;
    text-align: center;
    font-size: 16px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #000000;
}