body {
color: #000;
background: url(https://images.cnblogs.com/cnblogs_com/blogs/721779/galleries/2073490/o_211203100213_preview.jpg) fixed;
background-size:100% 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
}