Choose your Google account. You will be sent straight back to the site.
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You are signing in to a site Casso hosts. It gets your name and email address from Google, never your Google password.
Why casso-websites.com?
Casso hosts this site and handles its Google sign-in.
Google only talks to one address per sign-in service, so every site Casso hosts signs in through this page. Casso keeps nothing from your Google account except what the site needs to recognise you: your email address and name.