### Problem to solve I often find myself scrolling past collapsed file diffs when reviewing MRs, probably because my brain recognise the notice replacing the content as white space, instead of something of importance. ### Further details  This may be emphasised because I use a dark theme for diffs, but the notice about the collapsed diff has a light background. ### Proposal Apply a styling similar to the code to the notice. Or do something else to make the notice stand out and alert me that there's something that needs my attention. ### What does success look like, and how can we measure that? Success is when I remember to expand the collapsed diffs as part of my code review. As the diffs are fetched via XHR, I bet it's quite easy to measure whether I remember to expand the diffs.