#home {
    margin: 0 auto;
    width: 90%;
    min-width: 950px;
    background-color: #fff;
    padding: 30px;
    margin-top: 50px;
    margin-bottom: 50px;
    box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}
body {
    background-image: url(https://images.cnblogs.com/cnblogs_com/star-eternal/1083258/o_timg.jpg);
    background-size: 1600px 800px;
    background-attachment: fixed;
}
#home{   
      filter:alpha(opacity=50);   
      -moz-opacity:0.8;   
      -khtml-opacity: 0.8;   
      opacity: 0.7;   
}