React + Styled Components

What are you most proud of, and what would you do differently next time?

A little challenge but I love that kind of design!

What challenges did you encounter, and how did you overcome them?

I didn't encouter specific challenge.

What specific areas of your project would you like help with?

For example, I have this global css variable : --spacing-xs: 12px;

If I want tu use it : padding-top: var( --spacing-xs);

But what if I want to have em instead of px? I tried something like this: calc((var(--spacing-xs) / 16px) * 1em) But it didn't work.