Accordion is white on gray background only in Firefox

[gfellerph]

According to the design (https://www.figma.com/file/xZ0IW0MJO0vnFicmrHiKaY/Components-Post?type=design&node-id=17964-19595&mode=design&t=vpWlURmWHXKsP1ro-4), an accordion on a white background should be gray and white on a gray background. This behaviour only works in Firefox. Chrome, Safari and Edge show a gray accordion on a gray background.

Firefox:

Others:

[gfellerph]

Changing backgrounds is not documented anymore.

[gfellerph]

@alizedebray please retest and re-evaluate if this is still an issue