Readable is a cool script that allows you to view page content in a format more conducive to reading.You specify how you want text formatted, drag a button to your bookmarks bar, and then use it on any page you want formatted.
The user is not constrained by whatever formatting decisions the page designer made.
Why not a similar (user-customizable) script that rendered existing identity UI components in the page how the user wanted them?
For myself, I've always thought log-in buttons should be blinking. And purple.