fix: don't wrap external link CSS content (#967)

I am by no means a CSS expert, but this is what ChatGPT recommended me
to do and it seem to fix the underlying issue.

This fixes issue 966.

### Prerequisites

Put an `x` into the box(es) that apply:

- [x] This pull request fixes a bug.
- [ ] This pull request adds a feature.
- [ ] This pull request introduces breaking change.

### Description

It fixes #966.

#### Resources

- [x] If you have changed any SCSS code, run `make release` to
regenerate all CSS files

#### Contributors

- [x] Add yourself to `CONTRIBUTORS.md` if you aren't on it already

## Before screenshot

<img width="924" alt="before"
src="https://github.com/user-attachments/assets/ae24f797-40aa-4ee8-bbc5-2b770f686364"
/>

## After screenshot

<img width="913" alt="after"
src="https://github.com/user-attachments/assets/a18ffac6-ec10-4532-9a64-863373506dca"
/>