Consider adding a background to diffs sent in emails

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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:

image

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

Edited by 🤖 GitLab Bot 🤖