body {
    background:  url(https://img2020.cnblogs.com/blog/2179599/202012/2179599-20201231000204376-462572250.jpg)fixed;}

#home {
opacity: 0.80;\\透明度
margin: 0 auto;
min-width: 950px;
width: 65%;
background-color: #fff;
padding: 30px;
margin-top: 30px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}