body {
color: #000;
background: url(https://images.cnblogs.com/cnblogs_com/jklover/1324349/o_61671754_p0.png
) fixed;
background-size: 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 16px;
min-height: 101%;
opacity: 0.8
}