body {
color: #000;
background: url(https://images.cnblogs.com/cnblogs_com/lhy-cblog/1639018/o_2001291129401.png) fixed;
background-size: 100%;
background-repeat: no-repeat;
font-family: "Ubuntu Mono",Consolas;
font-size: 13px;
min-height: 100%;
}