.header{
    margin: 0 auto;
    width: 100%;
    text-align: center;
    overflow: hidden;
    position: relative;
    height: 420px;
}
.header img{
    height: 420px;
    position: absolute;
    top:0;
    left:50%;
    transform: translateX(-50%);
}
.main{
    width: 842px;
    margin: 0 auto;
}
.main img{
    width: 100%;
    margin-top: 80px;
}
.footer{
    margin-top: 90px;
    background: #000;
    color: #fff;
    text-align: center;
    padding: 38px 0 37px;
    font-size: 13px;
}
.footer a{
    color: #fff;
    text-decoration: none;
}
.footer div{
    font-family: PingFangSC-Regular;
}