Color contrast is not Satisfactory

[akkshaychauhan]

Background and foreground colors do not have a sufficient contrast ratio Low-contrast text is difficult for many users to read. failing elements

[MelSumner]

This is a valid issue- we get around it in the navbar by making the font size large enough, but the button contrast does need work.

[MelSumner]

@wifelette we'll need to work on the branding when Ember orange is used with font sizes smaller than 18px - the white text color doesn't work.