Extra padding needed for Back to Top component at the bottom of the page

[GCHQ-Developer-701]

Summary of the bug

Back to top component is too close to the line at the bottom of the page where you have 'Last Reviewed' - extra padding needed?

🪜 How to reproduce

Navigate to any page and scroll down to the bottom where you have 'Last Reviewed'

📸 Screenshots or code

🖥 📱 Device

• Type: Desktop
• Device: MacBook
• Browser version: Safari 18.1.1

🧐 Expected behaviour

Back to top should have some padding and not be too close to the line

📝 Acceptance Criteria

If relevant, describe in full detail the different interactions and edge cases that the component or patterns needs to fulfil.

Given
When
Then

Additional info

Tell us anything else useful to help us fix or understand the problem.

[MI6-255]

Dependent on this: mi6/ic-ui-kit#2154