Dark mode support

[prquinlan]

Is this the right issue type?

• Yes, I'm planning work for this project team.

Summary

After playing a bit, I realised that I think the issue is dark mode being on for me is causing the contrast issues across browsers. Is this supported yet?

Acceptance Criteria

• Criterion A is met.
• Criterion B is met.
• Tests pass.
• Documentation added.

Confirm creation

• Ready to create this feature?

[vpnu]

Completed with #19