background: url(https://images.cnblogs.com/cnblogs_com/wxyz9527/1849405/t_200917075220wallhaven-vg67z8.jpg) fixed;
background-size: 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;