improve scroll-to-top button

[ravixalgorithm]

Is your feature request related to a problem? Please describe.
The scroll-to-top button is not visible in a light background

Describe the solution you'd like
I will improve this by changing its colour to make it visible during a light background

[fineanmol]

@ravixalgorithm Please Star ⭐️ the repo to earn 'hacktober-accepted' label for the event.\nMeanwhile, if you want to work on this issue, please raise a PR, and we will review and merge it.

[ravixalgorithm]

@fineanmol Pls mark this under Hacktoberfest 2024, it's a humble request.

[Harshvardhan5703]

assign it to me.