A11Y: Yellow on white (and vice versa) fails colour contrast

[ianmcburnie]

Yellow on White

White on Yellow

[ianmcburnie]

Offline decision was made to change the yellow to an orange. We will need a shade that passes colour contrast for normal sized text, due to the button text in "Code Eliminates" section.

[ianmcburnie]

This applies to the green too.