Bug Report
What is the issue?
Select menus and primary buttons, and possibly others, are unreadable when colours are inverted by using custom colours on Firefox 60. The oldest version we support. Latest Firefox is fine, and windows high-contrast is fine (though it doesn't apply on Firefox 60).
What steps are required to reproduce the issue?
https://nhsuk.github.io/nhsuk-frontend/examples/form-alignment/
What was the environment where this issue occurred?
- Operating System: Windows 11
- Browser: Firefox
- Browser version: 60
- NHS.UK frontend package version: 10.3.0
Is there anything else you think would be useful in recreating the issue?

Bug Report
What is the issue?
Select menus and primary buttons, and possibly others, are unreadable when colours are inverted by using custom colours on Firefox 60. The oldest version we support. Latest Firefox is fine, and windows high-contrast is fine (though it doesn't apply on Firefox 60).
What steps are required to reproduce the issue?
https://nhsuk.github.io/nhsuk-frontend/examples/form-alignment/
What was the environment where this issue occurred?
Is there anything else you think would be useful in recreating the issue?