styles and alignment of back to top

[shriyadindi]

📋 Description

Scroll back button and the chatbot are overlapping, resolved the bug.

Fixes #349

BEFORE:

AFTER:

Before submitting the PR, please make sure you have completed the following:

• I have followed all the guidlines mentioned in CONTRIBUTING.md.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if applicable).
• I have tested it locally and it works fine.
• Any dependent changes have been merged and published in downstream modules.

🏷️ Types of Changes

What type of changes does your code introduce? (Check all that apply)

• Bug fix (non-breaking change which fixes an issue) 🐛
• New feature (non-breaking change which adds functionality) ✨
• UI enhancement (non-breaking change which enhances UI) 🎨
• Documentation update 📚

Thank you for contributing to Research Nexus! We look forward to reviewing your PR and getting it merged!

[Harshdev098]

@shriyadindi It seems the previous PR changes are existing in this PR, open a PRs with different branches and make sure your previous changes of the PR does not included

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #355 has been merged! 🎉🎉

[shriyadindi]

@Harshdev098 Kindly assign the labels.