[Broken Website] the first main area of the page stays white background always

### Prerequisites

- [X] I [searched for any existing report](https://github.com/darkreader/darkreader/issues?q=is%3Aissue) about this website issue to avoid opening a duplicate.
- [X] I can reproduce this website issue in a new, unmodified web browser profile with Dark Reader installed as the only extension.

### Website Issue Description

The main area background is always white with the extension neither enabled nor disabled.

And I remember a few other sites with similar styles (have a wrapped div tag) also have this similar issue.

### Website Address

https://grow.google/certificates/interview-warmup/

### Steps To Reproduce

1. open the site then enable dark mode in the extension

### Screenshots

_No response_

### Operating System

win10 1803

### Web Browser name and version

Chrome 103

### Dark Reader version

4.9.63

### Additional Context

_No response_