Required asterisks have a very aggressive z-index

[sergei-maertens]

Mentioned in the #60 PR review

The red asterisk lays on top of the dropdown of react-select because it seems to have very aggressive z-indices. If this does not affect our integration in the Django admin, we can leave it as is, otherwise we'll need to do a CSS fix for this.

We try to avoid CSS in this library as much as possible (since bundling that along requires investment in build tooling) and for now we get by with @emotion/css CSS-in-JS solution, but it's all not particularly elegant.

[sergei-maertens]

Confirmed to be an issue even when embedded in our admin.