[bug]: No css variable

[JeremyKomarov]

Describe the bug
When build something in page builder
Row -> Tabs

in venia when you switch between tabs then the unselected tabs are are still displyed

To reproduce

Steps to reproduce the behavior:

i saw that in @magento->pagebuilder->lib->ContentTypes->tabs->tabs.module.css
there is this css:
.panel {
min-height: inherit;
composes: !empty_hidden from global;
}

i didnt find this css anyhwere "empty_hidden" and why its !empty_hidden ?
all other css are using just "empty_hidden"

and still couldnt find this css "empty_hidden" anywhere

1. Go to 'Admin -> content -> pages -> create page builder'
   with rows -> tabs->

Expected behavior
when you switch between tabs then the other tabs will be none displyed

[m2-assistant]

Hi @JeremyKomarov. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.
Add a comment to assign the issue: @magento I am working on this

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[glo82145]

@adobe export issue to JIRA project PWA as Bug

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/PWA-3356 is successfully created for this GitHub issue.