Docs: add CSS variables section in close button section #37782
Merged
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Description
This PR adds consistency in the docs by adding in the close button page a CSS var section, as it is done for other components.
This is linked to #36457 which was merged after the release of the 5.2 so the 5.3 added-in shortcode has been added as well.
Type of changes
Checklist
npm run lint
)Live previews
Related issues
Related to #36457