How to define nginx code for per Domain?

my /etc/nginx/nginx.conf code is : server { ..... location / { root /var/www/public_folder; index index.php index.html index.htm; } . . . }
------------------------------------------------------------------------------------------------------------------------------------ and my created Domain config file is: nano /etc/nginx/sites-available/definedname.com server { listen 80 default; listen 443 http2 default_server; listen [::]:443 http2 default_server; server_name definedname.com www.definedname.com; root /var/www/public_folder/definedname.com/$host; ..... }
------------------------------------------------------------------------------------------------------------------------------------ when I want to go to my first page, I see global configuration index.html text, who defined within the global configuration route in /etc/nginx/nginx.conf, this text show in my domain first page What is my mistake exactly?