Enhance the UI of cards.

[vinrusty]

Proposal

->Enhance the UI of the cards in the courses section.
->Enhance the UI of the cards in the testimonial section.
->Enhance the UI of the cards in the team section of the about page by fixing the padding.

[github-actions]

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[vinrusty]

/assign

[github-actions]

This issue has been assigned to vinrusty!
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