Dark theme

[Niyatizzz]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  /kind design
  /kind cleanup

• What this PR does / why we need it:
  hi, this pr resolves the dark-mode feature which was already present in the params but could not be implemented due to conflicting hardcoded inline styling and css issues, i have cleaned this up by replacing inline color styles with proper CSS classes ensuring that the .dark class toggles expected elements

• Which issue(s) this PR fixes:
  fixes issue Feature Request: Add Dark Mode Support #364
  fixes closed pr Added Dark Mode feature #365

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[Niyatizzz]

/assign @k82cn @Monokaix

hi, please review this pr and let me know if any changes are required
thanks