<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Label this issue](https://contributors.gitlab.com/manage-issue?action=label&projectId=278964&issueIid=24356) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=24356) </details> <!--IssueSummary end--> ### Problem to solve Currently when we receive a diff via email there is no background applied. If you're using a client with a dark background, it looks like so:  which is a bit hard to read ### Further details With the release of OS X Mojave and the system-wide dark mode there's a chance a lot more people will be using mail clients with dark backgrouds, so improving legibility for them is nice! ### Proposal We should add a background to the diffs sent in email notifications to ensure they're legible no matter the background ### Links / references