== Steps to recreate
1. Go to https://fr.wikipedia.org/wiki/Conf%C3%A9rence_de_Moguilev
2. Open the main menu and pin it to the sidebar
3. Click the subsection toggle button
Expected
- ToC and Main menu are aligned
- The toggle button icon should be fully visible
Observed
{F41522847}
### QA steps
Ensure the negative margins didn't affect the TOC in any of its myriad states.
- The TOC in the sidebar is aligned with the main menu
- The TOC arrows are fully visible (not clipped) in:
- Sticky header
- At low resolutions (in the floating button in the corner)
- Beside the page title
- The TOC text is not clipped when it spans multiple lines
### Developer notes
- The cutting off of the toggle buttons is due to 'contains:paint' styles, which is inconsistently applied. It should be applied to the sticky elements