buttons on login page have wrong background (or wrong text color)

Summary

The buttons on the login page have wrong background (or text color)

Steps to reproduce

Go to the page https://typo3.org/login/

Example URL

Same as before: https://typo3.org/login/

What is the current bug behavior?

The button text "Login" and "Sign Up" is hardly visibile; I think that the background is missing or wrong.

What is the expected correct behavior?

I think that the buttons should have an orange background - or the text should not be white

Relevant logs and/or screenshots