body {
background: url(https://images.cnblogs.com/cnblogs_com/aaronhua/1518046/o_69cabeb2gy1ft0hecrihaj21hc0u0alp.jpg) fixed;
}
#home{
margin: 0 auto;
opacity: 0.5;
width: 65%;
min-width: 1080px;
background-color: #fff;
padding: 30px;
margin-top: 50px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
transition: opacity 0.6s;
}
#home:hover {
opacity: 1;
}