[Broken Website] documentfoundation.org

### 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

White areas along the sides of the website.

### Website Address

https://www.documentfoundation.org/

### Steps To Reproduce

Visit the website with Dark Reader enabled.
Notice white areas along the sides of the website in the screenshot need fixing.

### Screenshots


### Operating System

Arch Linux

### Web Browser name and version

Firefox 108.0.1

### Dark Reader version

4.9.60

### Additional Context

I believe all subpages on the website have this same issue to varying degrees.