#home {
    margin: 0 auto;
    width: 80%;/*原始65*/
    min-width: 800px;/*页面顶部的宽度*/
    background-color: rgba(245, 245, 245, 0.7);
    padding: 30px;
    margin-bottom: 40px;
    box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}
body {
    background: rgba(12, 100, 129, 1) url('https://images.cnblogs.com/cnblogs_com/Penn000/1013849/o_fr.jpg') fixed no-repeat;
    background-position: 50% 5%; 
    background-size: cover;
}