body {
color: #000;
background: url(https://images.cnblogs.com/cnblogs_com/yryblogs/1923446/o_210127080251%E7%8C%9B%E7%94%B7%E6%B4%BE%E5%A4%A7%E6%98%9F.png) fixed;
background-size: 100%;
background-repeat: no-repeat;
#home {
opacity: 0.80;
margin: 0 auto;
width: 85%;
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);
}