body {
color: #000;
background: url(https://images2015.cnblogs.com/blog/1157313/201705/1157313-20170501152601539-1003854909.jpg
) fixed;
background-size: 1800px;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 101%;
}