Accessibility: Contrast of red-on-red warning (e.g. must allow requests for access)

[adam3smith]

Tested with WAVE & manually

On a project with restricted files and without terms of access (like this one), try to disable "Request Acess" and Save. The red warning doesn't have sufficient contrast

Rust tweaking the two reds a bit would suffice, eg. Make
Foreground: #AA4241
Background: #F7EDED
gets us >5
(I don't think we're using these elsewhere, so don't need to blend with other colors