#home {
margin: 0 auto;
opacity: 0.8;
width: 60%;
background-color: #fff;
padding: 30px;
margin-top: 50px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}
body{
background:url(https://images.cnblogs.com/cnblogs_com/moodblog/1913667/o_210109022127%E7%A7%A6%E6%97%B6%E6%98%8E%E6%9C%88%E5%94%AF%E7%BE%8E%E6%8F%92%E7%94%BB%E5%A3%81%E7%BA%B8_%E5%BD%BC%E5%B2%B8%E5%9B%BE%E7%BD%91.jpg) no-repeat center fixed;
}