refactor: darkmode.css ✨

[Nishitbaria]

Related Issue

655

Proposed Changes

I have mentioned All changes in the issue although I have use best practices and now the code is more readable ✨

Checklist

• [x] ✅ My code follows the code style of this project.
• [ ] 📝 My change requires a change to the documentation.
• [ ] 🎀 I have updated the documentation accordingly.
• [x] 🌟 ed the repo

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Output Screenshots

Screenshot #1	Screenshot #2
Title goes here	Title goes here
Image goes here	Image goes here

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[Nishitbaria]

Hey @agamjotsingh18 Please review my Pr I have used All Best Practice use in CSS and then Merge it