body {
color: #000;
background: url(
https://www.zcool.com.cn/community/0375ad155debc480000015995775d16.jpg
) fixed;
background-size: 100% 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 101%;
filter:alpha(opacity=70); -moz-opacity:0.7; -khtml-opacity: 0.7; opacity: 0.7;
}