Improve diff coloring in EmailOnPush messages
### Problem to solve Improve diff coloring in EmailOnPush messages ### Further details (Include use cases, benefits, and/or goals) ### Proposal The colors are very light. Diffs are way faster to read if the colors are more aggressive, like the ones in the screenshot: ![2017-10-11-151203_3840x1080_scrot](/uploads/7b067a5a81196916fe0648184843b359/2017-10-11-151203_3840x1080_scrot.png) (To compare here a gitlab mail: ![2017-10-11-151424_3840x1080_scrot](/uploads/3e3e13fd4c10759972a3df00971cf307/2017-10-11-151424_3840x1080_scrot.png)) ### What does success look like, and how can we measure that? (If no way to measure success, link to an issue that will implement a way to measure this) ### Links / references
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