Added copy button feature with styled code block

[IshikaBanga26]

This pull request adds a “Copy” button to the code snippet section in the Tip Calculator example, allowing users to easily copy example code with one click.
Additionally, minor UI improvements have been made to enhance readability and visual separation.

Changes Made:

Added a Copy button with clipboard functionality.

Styled

 blocks with a light background and border for better contrast.

Added margin above the code section for clear spacing.
Enhanced button hover feedback and alignment.
Impact:
Improves user experience and accessibility.
Makes example sections more interactive and visually clear.

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Project	Deployment	Preview	Comments	Updated (UTC)
learn-javascript	Error			Oct 29, 2025 10:45pm