My web server is running but ports 80/443 are refused

Your instance's local firewall is blocking them. Verda's images use ufw:

sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw enable

Check it took effect with sudo ufw status. Also confirm your service is listening on 0.0.0.0, not just localhost - and note that ufw's default rules don't block Docker container traffic, so a containerized service needs its own rules.