location /blog {
    alias /var/www/html/;
    index index.php index.html index.htm;
    try_files $uri $uri/ /blog/index.php$is_args$args;

    location ~ \.php$ {
        try_files $uri =404;
        include fastcgi_params;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass wordpress_web:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $request_filename;
        fastcgi_param PATH_INFO $fastcgi_path_info;
    }
}