updated index.html to show the text in dark mode

[Reshma-2301]

closes #833

🛠️ Fixes Issue

make the text visible in dark mode also ....previously it was not visible under dark mode

👨‍💻 Changes proposed

✔️ Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

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