(Fix GitHub icon positioning to bottom middle of sidebar)fix#1

[Aparna-256]

• Moved GitHub icon from left position to bottom middle of sidebar
• Added proper margin-top (70vh) to position at bottommost area
• Maintained centered horizontal alignment
• Fixed [Frontend] Adjust the Timer Size #1

Description

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Please also include relevant motivation and context.
List any dependencies that are required for this change.

Fixes # (issue)

Type of change

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• 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)
• This change requires a documentation update

Checklist:

• 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules
• I have added all the three reviewers: @vinitshahdeo, @Kashish121 & @ishika1727