nginx default configuration to handel 443 and 80

default

server {
	listen 80 default_server;
	listen [::]:80 default_server;
	root /var/www/html;
	index index.html index.htm index.nginx-debian.html;
	server_name _;
}
server {
        listen       443 ssl default_server;
        listen       [::]:443 ssl default_server;
        server_name _;
	root /var/www/html;
        index index.html index.htm index.nginx-debian.html;
	server_name _;
	ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
}