Added color to the navbar

[Adarsh08X]

Fix- 217

Change- Page contents were overlapping with the nav-bar contents due to transparency, i have added color to the nav-bar which will prevent them from overlapping.

[boss-contributions-bot[bot]]

Thanks @Adarsh08X, for opening the pull request! 🙌

One of our mentors will review the pull request soon. ✅

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