Rebass: Example for adding hover styles to button variant

[mrcoles]

Is there an example for adding hover styles to the variant for a Button component in the theme? https://rebassjs.org/theming/#button--card-variants

[jxnblk]

You can nest objects, the same as in styled-components or emotion:

// theme.js
buttons: {
  primary: {
    backgroundColor: '#07c',
    '&:hover': {
      backgroundColor: 'tomato'
    }
  }
}