I noticed that all the hex colors for CSS-in-JS are in uppercase:

For Sass they're in lowercase:

In the "Global values" page, the hex values are also in uppercase:

But in "Theme provider" page they're in lowercase:

Should we only stick to one letter case? If I had to choose I would prefer the lowercase. I think it has better readability.

Originally posted by @miukimiu in #5283 (review)