body{
background-image:url("https://images.pexels.com/photos/1353968/pexels-photo-1353968.jpeg?cs=srgb&dl=pexels-1353968.jpg&fm=jpg");
background-repeat:no-repeat;
background-size:100%;
background-attachment: fixed;
filter:alpha(opacity=95); -moz-opacity:0.95; -khtml-opacity: 0.95; opacity: 0.95;
color:black;
font-family:微软雅黑;
font-size:14px;
}