body
{
    background-image: url("");
    font-size:14px;
    /*字体大小：18像素*/
}
#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: #ff;/*背景颜色*/
    overflow:auto;
}
body {
    font-size:18px;
/*字体大小：18像素*/
    font-family:"微软雅黑","微软雅黑",微软雅黑!important;
    background: url('https://i.loli.net/2018/04/07/5ac83337869b1.png') no-repeat fixed top;
    background-size: cover;
}