body { 
background-repeat: no-repeat; 
background-image: url("https://gss0.baidu.com/9fo3dSag_xI4khGko9WTAnF6hhy/zhidao/pic/item/1ad5ad6eddc451da5bf8c1bdb0fd5266d016325e.jpg") ;
background-size:100% 100%;
-moz-background-size:100% 100%;}
}

#masthead {
    background-color: rgb(23, 24, 28);
    background-image: url(“https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1547180024149&di=05e27d6ee0d1433b110fb03b8cbd9e5a&imgtype=0&src=http%3A%2F%2Fdingyue.nosdn.127.net%2FO7q5y0xUfRLVGuElWqEnoduWXDx7GLjlJAN4WqYi2nKYd1537130434799.jpeg”);
}