I'm just wondering if the Uptown CSS framework (https://www.uptowncss.com) is still accepted by Shopify for the design of embedded apps?
Reason being, my app doesn't use react, so I'd just be using the Polaris CSS which has more complicated tag names than Uptown (...and I've already started implementing Uptown). Uptown is a couple of years old at this point, so the Shopify's style guide may have diverged since then.
Thanks in advance,
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