Improved Text Visibility on the Landing Page

[AayushKaushik15]

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Additional information

Previously, the text on the landing page was not clearly visible due to the black background color. I adjusted the NavBar.css file to correct the color issue, ensuring that the text is now easily readable and also correct the text color code of hero section.

This is my first contribution to the project, and I hope it improves the user experience by making the content more accessible.

[github-actions]

Hey @AayushKaushik15, Thanks for contributing and Congrats on opening Issue 🎉

We will try to review as soon as possible and a maintainer will get back to you soon!