Looking for logging into the Google Design site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Google Design site. After that you can login as usual with your login credentials.
https://developers.google.com/identity/branding-guidelines
https://developers.google.com/identity/
https://design.google/
https://www.google.com/forms/about/
https://colorlib.com/wp/html5-and-css3-login-forms/
https://uxdesign.cc/designing-a-user-friendly-login-25855ae0cc88
https://accounts.google.com/
https://sourcey.com/articles/beautiful-android-login-and-signup-screens-with-material-design
https://uxplanet.org/designing-ux-login-form-and-process-8b17167ed5b9
https://www.cloudcodes.com/gcontrol/features/custom-login-page-for-google-apps.html
https://github.com/google/material-design-icons/issues/286
https://stackoverflow.com/questions/44740399/change-facebook-googles-login-buttons-shape-style
https://material.io/tools/icons/