Become A Scratcher Onboarding Bug

[MaterArc]

Expected Behavior

You would expect the arrow buttons to go through the onboarding process to be fully visible

Actual Behavior

The arrows, as seen instatic/images/onboarding/right-arrow.svg, are the same color as the onboarding background and thus give the appearance that they aren't there.

Steps to Reproduce

1. Go through the Become a Scratcher onboarding process
2. Try to go through the slides

System Details

macOS 10.15.7

Screenshots

It used to look like this with the purple background, which was visible: