updating high contrast and high contrast (dark) color palettes

[sarahjohn1]

This pull request would close #87

Updated the color palettes for both high contrast and high contrast (dark). From the re

1. Original High Contrast Dark

2. Classic Dark (for reference, was not edited)

2. Updated High Contrast Dark

4. Original High Contrast

5. Updated High Contrast

[cjquines]

lgtm.

i wonder if we can have a build step that ensures high contrast colors are wcag aaa?

[psvenk]

Thanks for the PR; these colors have much better foreground/background contrast than what we have currently. I just have a few questions:

• Could we make the purple (#BA68C8) a little lighter so that it passes WCAG AAA?
• The blues (#4FC3F7 and #64B5F6) are very similar to each other, as are the red and the pink (#FF6B6B and #FF80A4) to a lesser extent. Would it be possible to make them more distinct while keeping them distinct from the other colors and compliant with WCAG AAA?

[sarahjohn1]

Yes of course, here are updated values and wcag contrast checkers, sorry I didn't think of this earlier! Values are updated and here are screenshots to accompany.

[psvenk]

Looks good to me; thank you! I think this is ready to merge once highContrastDark is also updated accordingly.