body {
color: #000;
background: url(https://www.cnblogs.com/images/cnblogs_com/smile-inhibit/1396887/o_timgs.jpg
) fixed;
background-size: 100%  100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 100%;
}