body {
color: #000;
background: url("https://images2017.cnblogs.com/blog/771958/201801/771958-20180125231256631-321951196.png") fixed;
background-size: 1500px;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 101%;
}
#home {
opacity: 0.80;
margin: 0 auto;
width: 65%;
min-width: 1200px;
background-color: #fff;
padding: 30px;
margin-top: 30px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}