body {
color: #000;
background: url(https://ns-strategy.cdn.bcebos.com/ns-strategy/upload/fc_big_pic/part-00495-1576.jpg) fixed;
background-size:100% 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
}