dark-light mode button is not working

[heli0707]

Describe the bug
the only button is the toggle button theme of the website doesn't change

Expected behavior
when we toggle the button that changes the light theme to the dark theme

Screenshots
https://github.com/Sahil1786/Petari/assets/95361125/19173c20-e313-4984-af63-d2ebfe50ec02
not changing theme

assign this issue to me I will complete it!

[github-actions]

Congratulations, @heli0707! 🎉 Thank you for creating your issue. Your contribution is greatly appreciated and we look forward to working with you to resolve the issue. Keep up the great work!

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