CSS for all nodes within category node?

[makanyane]

I've got header banner images that can change via extra.less:
Code:

[data-container-key="node-10"] .p-header {
  background-image: url("data/assets/style_properties/my_banner_variant.webp");
}

That works, and if node-10 is a 'forum' all the threads in the forum show with that header.

If node-10 is a category, the category page shows that header, but the forum nodes (and their threads) within it don't.

Is it possible to do this in a way that the forums/sub-forums that are children of the...

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CSS for all nodes within category node?

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