SOURCE

div.skin-box-bd {
    position: relative;
    top: -150px;
    left: -485px;
    width: 1920px;
    height: 30px;
    padding-top: 120px;
    line-height: 100px;
    background: #343297 url(https://img.alicdn.com/imgextra/i3/948785546/O1CN01PlxDQp1qq7Arhsmkw_!!948785546.jpg);
    background-position: center -150px;
    padding-left: 485px;
}

body {
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
}