Improved UI for high contrast mode

[jackdomleo7]

---

name: 🙋‍♂️ Feature
about: Submit a new feature
labels: 'enhancement'
title: '[FEATURE]: <title>'

Feature description

Improved UI for high contrast mode.

Example using Windows Night Sky:

Before:

After:

Why is this feature important?

Improves accessibility.

Did you test on all major browsers?

• Chrome
• Firefox
• Edge
• Safari

Other details

N/A

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T&Cs

• I confirm I have read and understand the contributing guidelines
• I understand the work in this pull request will not be released straight away and will appear in a future release (if approved)
• I confirm the work in this pull request is true and valid to the best of my knowledge