benga.conf: /etc/nginx/sites-enabled/benga.conf, error.log: /var/log/nginx/error.log, ls: ls -al /var/www/benga/static/

benga.conf

server {
    listen 80;
    listen [::]:80;
    server_name 54.210.169.179;
    charset utf-8;

    root /var/www/benga;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }

    location /static/ {
        alias /var/www/benga/static/;
    }
}

error.log

...
2019/05/29 01:26:59 [error] 31804#31804: *12 open() "/var/www/benga/static/page.css" failed (13: Permission denied), client: 59.120.22.19, server: 54.210.169.179, request: "GET /static/page.css HTTP/1.1", host: "54.210.169.179"

ls

total 36
drw-rw-rw- 5 www-data www-data 4096 May 27 08:25 .
drwxr-xr-x 3 www-data www-data 4096 May 29 01:44 ..
drw-rw-rw- 6 www-data www-data 4096 May 27 08:25 admin
-rw-rw-rw- 1 www-data www-data 9805 May 27 08:25 dropzone.min.css
drw-rw-rw- 2 www-data www-data 4096 May 27 08:25 frontend
-rw-rw-rw- 1 www-data www-data 1920 May 27 08:25 page.css
drw-rw-rw- 7 www-data www-data 4096 May 27 08:25 rest_framework

ps aux | grep nginx

root     31977  0.0  0.0 140628  1512 ?        Ss   02:03   0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data 31981  0.0  0.1 143300  6160 ?        S    02:03   0:00 nginx: worker process
www-data 31982  0.0  0.1 143300  6160 ?        S    02:03   0:00 nginx: worker process