A dark UI theme for Atom based on 'Atom Dark UI'. Suggested syntax highlighting theme: Seti (Blue or Steel theme)
Windows: Atom does not support theming of top app title bar nor menu bar. There is however a package to do that: title-bar-replacer (tested as of Atom 1.37.0)
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.