I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[ ] Feature request
[X ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ X] Other... Please describe: AIO css

Current behavior

Background of all pages is a light (20%) gray.

These light grays have been used extensively on the web because they soften the harsh black-and-white look. They also reduce contrast, which with some background-text combinations (such as 80% gray text on 20% gray background) makes the doc harder to use for some users.

Light gray background also means that all graphics need to either be transparent or have borders so the white background of the graphics looks normal.

Expected behavior

It would be interesting to see if a white background improves readability/look overall, esp with the blue font areas, in tables, and near graphics.

Minimal reproduction of the problem with instructions

See https://angular.io/guide/architecture#whats-next

What is the motivation / use case for changing the behavior?

Accessibility
Ease of creating graphics that look well-integrated with the site

Environment

Angular version: X.Y.Z


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others: