body{
background: url('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1551207183450&di=dcb144347f522f1964fc0b822aa88ab5&imgtype=0&src=http%3A%2F%2Fimg4.duitang.com%2Fuploads%2Fitem%2F201404%2F09%2F20140409141418_ECHed.jpeg');

}

#navigator {
    background-color: rgba(1,1,1,0.5);
}