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While working on this project, I found centering elements while maintaining responsiveness to be challenging, especially with the flip clock design. How do you tackle such alignment issues in your projects, and are there any CSS tricks or practices you find indispensable?

I used CSS variables for theming and applied a box-shadow effect on the adviceContainer. Drop-shadow caused text to be invisible on iOS webkit. Are there any best practices I might have overlooked or additional CSS techniques that could enhance the visual appeal or performance of my app?