#home {
    margin: 0 auto;
    width: 60%;/*原始65*/
    min-width: 980px;/*页面顶部的宽度*/
    background-color: rgba(220, 220, 220, 0.75);
    padding: 50px;
    margin-top: 30px;
    margin-bottom: 40px;
    box-shadow: 6px 6px 20px rgba(100, 100, 100, 0.4);
}
body {
    background: rgba(12, 100, 129, 1) url('https://img2018.cnblogs.com/blog/1521187/201902/1521187-20190216202121141-848053455.jpg') fixed no-repeat;
    background-position: 50% 5%; 
    background-size: cover;
}