header {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.header-top {
    width: 1920px;
    height: 80px;
    display: flex;
    align-items: center;
}
.header-top .login {
    width: 785px;
    display: flex;
    flex-direction: row-reverse;
    margin-right: 30px
}
.header-top .nav{
    flex: 1;
    display: flex;
    justify-content: space-around;
    align-items: center;
    font-weight: bold;
}


.header-top .header-right {
    width: 318px;
    display: flex;
    padding-left: 10px;
    align-items: center;
}
.header-bottom {
    width: 100%;
  
    position: relative;
    overflow: hidden;
}
a {
    color: #000;
    text-decoration: none;
}
 li{
    list-style: none;
  }


.login img {
    width: 404px;
    height: 46px;
}

.box{
    width: 1920px;
    box-sizing: border-box;
    margin:auto;
  }