Steps to replicate the issue (include links if applicable):
- Go to https://en.wikipedia.org/wiki/Chang%27e_6
- Enable dark mode if it isn't
What happens?:
Section expand icon is in black.
What should have happened instead?:
It should be in white.
| Actual | Expected |
 |  |
Other information (browser name/version, screenshots, etc.):
This is because that image uses mask-image and those work differently with background-color:
