Need help in tricky css design

As part of my practice, I am currently working on a CSS challenge that involves a particularly tricky design. I have attached an image of the design I am trying to achieve. Despite my best efforts, I have been unable to replicate it successfully.

I would be immensely grateful if any one could provide some guidance on how to achieve this specific design. Your expert advice would be invaluable in helping me overcome this challenge.
challenge.png
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