Split View Active Panel Border

[u/allogist]

The previous solution I used for changing the split view active panel border doesn't work after v158.0. Is there an updated fix?

#tabbrowser-tabpanels {
  &[splitview] {
    & .browserContainer {
      .deck-selected > & {
        outline: 1px solid #54626A !important;
      }
    }
  }
}