Steps to replicate the issue (include links if applicable):

• Select a diff with some more complicated changes (easiest to compare revisions over a longer period of time)
• Use a smaller mobile phone. My screenshot is of a iPhone Pro 14, but its significantly worse on smaller phones

What is noticeable is that the diff isn't really using its available margin space optimally. Note how the inset of the article is higher than the inset of the 'diff' controls. Not also how the inset of the details in the annotation are inset, but this distinction can be done with something like a left border indicator (like we do for quotes), instead of using a margin consuming the limited margin space on mobile.

As a second step, we could consider making the annotation collapsible somehow ?

What happens?:
Not how the diff is hard to read because now it has to display the annotations as well as the article.

What should have happened instead?:
The diff should be readable.

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

Annotations with indication for possible winning back some screen real estate