#home {

    margin: 0 auto;

        margin-top: 0px;

        margin-bottom: 0px;

    width: 75%;/*大白框的宽度*/

    min-width: 650px;/*最小宽度*/

    background-color: #ffffffe6;/*颜色 我比较喜欢不特别透的*/

    padding: 30px;

    margin-top: 70px;

    margin-bottom: 50px;

    box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);

}
body {

    color: #000;

    background:url(https://cdn.luogu.com.cn/upload/image_hosting/0ra707b3.png) no-repeat fixed;/*url里放图片地址*/

    background-size:cover;

    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;

    font-size: 12px;

    min-height: 101%;

}