How to configure static resources under nginx 80 port

as mentioned, I want to show my static page on port 80.
below / var/www/blog is the configuration file of my static resource
nginx / etc/nginx/cond.f/blog.conf . I wrote this

.
server {
    listen 80;
    location / {
        root /var/www/blog;
    }
}

but after restarting nginx, it is found that the website reports 404, but changing the port to 8080 can access the static resource.
Thank you for your advice on how to configure it. Thank you
nginx.conf for your advice. The configuration is as follows

.
user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
    worker_connections 768;
    -sharp multi_accept on;
}

http {

    -sharp-sharp
    -sharp Basic Settings
    -sharp-sharp

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    -sharp server_tokens off;

    -sharp server_names_hash_bucket_size 64;
    -sharp server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    -sharp-sharp
    -sharp SSL Settings
    -sharp-sharp

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; -sharp Dropping SSLv3, ref: POODLE
    ssl_prefer_server_ciphers on;

    -sharp-sharp
    -sharp Logging Settings
    -sharp-sharp

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    -sharp-sharp
    -sharp Gzip Settings
    -sharp-sharp

    gzip on;
    gzip_disable "msie6";

    -sharp gzip_vary on;
    -sharp gzip_proxied any;
    -sharp gzip_comp_level 6;
    -sharp gzip_buffers 16 8k;
    -sharp gzip_http_version 1.1;
    -sharp gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    -sharp-sharp
    -sharp Virtual Host Configs
    -sharp-sharp

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}


-sharpmail {
-sharp    -sharp See sample authentication script at:
-sharp    -sharp http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
-sharp
-sharp    -sharp auth_http localhost/auth.php;
-sharp    -sharp pop3_capabilities "TOP" "USER";
-sharp    -sharp imap_capabilities "IMAP4rev1" "UIDPLUS";
-sharp
-sharp    server {
-sharp        listen     localhost:110;
-sharp        protocol   pop3;
-sharp        proxy      on;
-sharp    }
-sharp
-sharp    server {
-sharp        listen     localhost:143;
-sharp        protocol   imap;
-sharp        proxy      on;
-sharp    }
-sharp}
Mar.10,2021

Port 80 is not good, but port 8080 is fine. You should check for port conflicts or check configuration files (nginx.conf and other conf files).
by the way, where is your servername?

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