Should Sign in with SSO be a button? Or should it be a link? If a button, should it be in red color, or black, or blue, etc?
Check the link "Login with SSO" in this example: https://trello.com/login
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For the color it depends on the palette that you are using. Personally I like the UX sentry uses for their SSO which is a more smooth experience compared to Trello's.