A nice 404 page for pihole with an added automatic script that can be used to whitelist the domain with the click of a button.
Why do you think that https://github.com/rajannpatel/Pi-Hole-on-Google-Compute-Engine-Free-Tier-with-Full-Tunnel-and-Split-Tunnel-Wireguard-VPN-Configs is a good alternative to Pihole-404