Fix button focus background issue for twenty twenty-one theme

[nikunj8866]

Trac ticket: https://core.trac.wordpress.org/ticket/63291

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[nikunj8866]

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[nikunj8866]

After Fix

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[SirLouen]

I don't recommend using --global--color-black

2021 was the last non-block theme. --global-color global settings is a variable introduced in 5.8, for theme.json and 2021 was introduced in 5.6.

I would simply switch to a plain color.

[nikunj8866]

@SirLouen

Thank you for the feedback.

I’ve reviewed the theme, and I don’t see any instance where the --global--color custom property is defined. If there's a specific location where this appears, please let me know and I’ll be happy to investigate further.