#home {
    margin: 0 auto;
    width: 75%;
    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);
    filter:alpha(opacity=90); 
    -moz-opacity:0.5; 
    opacity:0.9;
}
body {
    font-size: 15px;
    padding: 0;
    margin: 0;
    background: #efefef url(https://images2017.cnblogs.com/blog/885520/201708/885520-20170828164353499-610619596.jpg) no-repeat top left fixed;
}