body {
    color: #000;
    background-color: #e6e6e6;
    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
    font-size: 12px;
    min-height: 101%;
    background-image: url(https://images.cnblogs.com/cnblogs_com/pufa/1886986/o_210120054005back_img.png);
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
}
#home {
    margin: 0 auto;
    width: 80%;
    min-width: 950px;
    background-color: #fff;
    padding: 30px;
    margin-top: 50px;
    margin-bottom: 50px;
    box-shadow: 0 2px 6px rgba(100,100,100,.3);
    opacity: 0.75;
}