body {
    background: url('https://images.cnblogs.com/cnblogs_com/Akatsuki-Sanjou/1695592/o_200411131322timg.jpeg');
    background-position: center 0;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
}

#home {
    opacity: 0.90;
}