[Docs] Improve visibility of carousel navigation

[Sbragul26]

Current State

The left and right navigation buttons in the Related Videos carousel are barely visible. The indicator at the bottom is also hard to notice, making it difficult to know the current slide.

Desired State

The navigation buttons and the bottom indicator should be clearly visible and easy to use.

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[PARTH-TUSSLE]

Hey @Sbragul26 , I'd like to work on this issue. Could you assign it to me?

[piyushtripathi9424]

Hey @Sbragul26 , Can you assign this issue to me?

[anjalichhikara-0907]

I would also like to work on this please.

[Sbragul26]

Thanks everyone. Since @PARTH-TUSSLE is already working on another issue, I'll assign this one to @piyushtripathi9424.