body {
color: #000;
background: url("//img2020.cnblogs.com/blog/1192555/202011/1192555-20201117160043354-339363273.jpg");
background-attachment:fixed;
background-position:0px -80px;
background-size: 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 80%;
}
#home {
opacity: 0.80;
margin: 0 auto;
width: 65%;
min-width: 950px;
background-color: #fff;
padding: 30px;
margin-top: 30px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}