body{
color: #000;
background: url(https://images.cnblogs.com/cnblogs_com/zptcszj/1442239/o_preview.jpg) fixed;
background-size:cover;
}
#home {
margin: 0 auto;
opacity: 0.8;
width: 65%;
min-width: 1080px;
background-color:whitesmoke;
padding: 30px;
margin-top: 50px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}