This page tests both login buttons. Both should be visible below.
Check browser console for click events
Google OAuth endpoint: /api/oauth/google
Manus OAuth endpoint: https://manus.im/app-auth?appId=hATeTFxU5RM4rWsCdW4Npq&redirectUri=https%3A%2F%2Fpackstud.io%2Fapi%2Foauth%2Fcallback&state=aHR0cHM6Ly9wYWNrc3R1ZC5pby9hcGkvb2F1dGgvY2FsbGJhY2s%3D&type=signIn