Fix: Restore Sidebar Styling Modified by PR #109

[DeshDeepakKant]

This commit restores the original styling of the sidebar that was unintentionally altered by PR #109 ('Improve website icons and styling').

Changes:

• Reverted modifications to the sidebar's appearance.
• Ensured consistency with the previous design.

Before	After

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[LiZhenCheng9527]

LGTM. But I think we can first clarify the project requirements in the issue or on Slack.

[Murdock9803]

@LiZhenCheng9527 we can open issues for different areas of improvement in the site, and then we can use these issues as task checklist when the project is being done 🙌
This way we can document the goals 🙌