Polaris does have a CSS file - https://github.com/Shopify/polaris-react#using-the-css-components https://github.com/Shopify/polaris-react#using-the-css-compo...

Polaris does have a CSS file - https://github.com/Shopify/polaris-react#using-the-css-components https://github.com/Shopify/polaris-react#using-the-css-compo... You are free to use it as you want, it doesn't support the dynamic components obviously since it's CSS. But you can easily reimplement the parts you want.