Shuriken UI register a set of Tailwind plugin that contains components. Each of them can be customized using the theme.extend.shurikenUi object in the tailwind.config.ts file.
This is an example to disable the default focus ring on all components:
.app/tailwind.config.ts
Here is another example to increase errors font size and weight of input component:
.app/tailwind.config.ts
Useful resources: