Fix: OSL website styling

At the [pages/partnership/partners/index.md](https://opensciencelabs.org/partnership/partners/) page, there's a styling issue that makes some text unreadable.

<img width="1351" alt="Image" src="https://github.com/user-attachments/assets/3f0b8ad6-0625-4ddb-b64a-dd5056d0396b" />

