This is just an simple rebuild Slack-like (the messenger app) Atom UI.
If you found a bug, feel free to create an issue.
Open up a console windows and type:
$ apm install slack-like-ui
inside Atom's settings select Install, click Themes and search for slack-like-ui.
v1.1.0 | Edit the Readme.md v1.0.0 | Initial Commit
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.