If you are an organisation support user, you can turn on the option for your users to login with their gmail accounts.

Simply login to your account and navigate to Support > Organisations > {Your Organisation} > Whitelabel. You should then tick the box next to Google Account.

Once you have done so, when users access your whitelabelled url they will be able to select "Sign in with Google Account".

Please note that this will only provide them access if their google account uses the same email as their Avvoka account, and their account must have been created prior to them trying to login.