body {
    background: url(https://images.cnblogs.com/cnblogs_com/blogs/696333/galleries/2008693/o_220117034552_%E6%9C%95%E7%9A%84%E5%A4%B4%E5%83%8F%20-%20%E7%94%A8%E4%BA%8Ecnblogs.jpg) fixed;
    opacity: 0.6;
    background-size: cover;
    background-repeat: no-repeat;
    min-height: 101%;
}
#home {
    width: 50%;
    /* margin-left: 5%; */
}