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
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Bug fix (non-breaking change which fixes an issue)
Checklist
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I have read the contributing guidelines -
My code follows the code style of the project (using npm run lint) -
My change introduces changes to the documentation -
I have updated the documentation accordingly - (NA) I have added tests to cover my changes
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All new and existing tests passed
Live previews
Related issues
Related to #36457