body{
    background-image: url(../../img/body_top.png);
    background-repeat: no-repeat;
    background-size: cover;
    height: 100%;
    background-attachment: fixed; /* 背景图片固定 */

    margin: 0;
    font-family: "微软雅黑", sans-serif;
    background-color: #1e1e1e;
    color: white;
}