Bug: Dark Mode button is not looking good

[Devvart1]

What happened?

Dark Mode buttor color and symbol inside are white (same color), and symbol is not visible.

GSSOC'24

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What browsers are you seeing the problem on?

No response

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• [X] I have checked the existing issues
• [X] I have read the Contributing Guidelines
• [X] I agree to follow this project's Code of Conduct
• [ ] I want to work on this issue

[github-actions[bot]]

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[ANI2707]

@Saurav-Pant I want to work on this issue; please assign it to me.