Add styles to "indeterminate" checkbox example

[smhutch]

Documentation

The example shown below doesn't have any visual change when toggling the indeterminate state.

My suggestion would be to show an indeterminate state, similar to this:

Relevant Radix Component(s)

Checkbox

Examples from other doc sites

n/a

[jjenzz]

@smhutch Thanks for raising this. It appears there are a few issues with the dark theme in our docs as I can see the indeterminate state is fine in the light theme:

I'm transferring this issue to the @radix-ui/website repo as it's not an issue with the primitives themselves.

Thanks again 👍

[benoitgrelard]

This will be fixed soon once we overall the styling after our colors are released as mentioned here: https://github.com/radix-ui/website/issues/165#issuecomment-846481397

[benoitgrelard]

This has been resolved.