Can't customize interchain-ui button color in react-components

[samsiegart]

When using @agoric/react-components it's expected that the developer can change the button colors in the connect wallet and provision smart wallet modals to something other than the default blue. However, passing overrides or custom themes to the ThemeProvider as documented in https://docs.cosmology.zone/cosmos-kit/migration-to-v2 does not work. I think this has to do with the css-in-js library the interchain-ui uses, and the css doesn't get applied properly because react-components is bundled separately as a dependency. The customization works for interchain-ui components used within the app itself, but not for interchain-ui components that @agoric/react-components renders.