body {
    font-size:16px;/*字体大小*/
    font-family:"微软雅黑","微软雅黑",微软雅黑!important;
    background: url('https://images.cnblogs.com/cnblogs_com/SpeedZone/1000472/o_EVO8.jpg') no-repeat fixed top;
}
#home {
    opacity: 0.85;/*不透明度，取值范围0-1，越小背景越清晰，字体越不清晰*/
    background: #fff;/*背景颜色*/
}