[WIP] Update CSS variables to Tailwind classes

[Copilot]

Thanks for the feedback on #4162. I've created this new PR, which merges into #4162, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #4162
Triggering comment (#4162 (comment)):

@copilot Can you leave a review? --spacing() is an actual tailwind function for your information.

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Latest commit: f0eb037

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