Standardize 'Back to Top' button design across all pages

[Priyanshi0112]

🛠️ Fixes Issue

Fixes: #2908

👨‍💻 Description

What does this PR do?

This update ensures a consistent design for the "Back to Top" button on every page of the site. The button styling has been aligned with the "Back to Top" button found on the About page, as it offers an optimal user experience. This enhancement improves usability and visual uniformity across the website, making navigation smoother for users.

• Briefly describe the feature or bug fix you've implemented.
• Highlight any major changes or added functionality.
• Mention how it enhances the project.

📄 Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (adds or updates related documentation)

📷 Screenshots/GIFs (if any)

sample.mp4

✅ Checklist

• I am a participant of GSSoC-ext.
• I have followed the contribution guidelines of this project.
• I have made this change from my own.
• I have taken help from some online resources.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have added documentation to explain my changes.

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

🤝 GSSoC Participation

• This PR is submitted under the GSSoC program.
• I have taken prior approval for this feature/fix.

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