atom-name-that-color

Convert CSS hex code to human readable color name
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name-that-color package

Convert CSS hex code to human readable color name.

Configure keyboard shortcut command

name-that-color:name-selection

This line will add a keyboard shortcut for control + alt + command + n in mac

Atom > Preferences > keymap.cson > "ctrl-alt-cmd-n": "name-that-color:name-selection"