How to redirect Nginx non-www to www domain over SSL

$ sudo vi /etc/nginx/sites-enabled/yourdomain.com.conf

### redirect HTTPS n
server {
 listen 443 ssl;
 server_name theos.in;
 ssl_certificate /etc/nginx/ssl/letsencrypt/non-www.theos.in/theos.in.cer;
 ssl_certificate_key /etc/nginx/ssl/letsencrypt/non-www.theos.in/theos.in.key;
 return 301 https://www.theos.in$request_uri;
}

# Redirect www.yourdomain.com:80 to https://www.yourdomain.com:443
server {
    listen      80;
    access_log  off;
    error_log   off;
    server_name www.yourdomain.com;
    return         301 https://$server_name$request_uri;
}
# # Redirect http://yourdomain.com:80 to https://yourdomain.com:443
server {
    listen      80;
    access_log  off;
    error_log   off;
    server_name yourdomain.com;
    return         301 https://$server_name$request_uri;
}

$ sudo systemctl reload nginx

curl -IL https://yourdomain.com/
curl -IL http://yourdomain.com/