Open Extensions sidebar panel in VS Code. View → Extensions
Search for Night Sky - find the one by ChrisRu - there are a few other half-baked ones so make sure you have the right one!
Click Install to install it.
Click Reload to reload the your editor
Code > Preferences > Color Theme > Night Sky
Development
Install the dependencies using either yarn or npm install
In VSCode, open the debug window (Ctrl+Shift+D) and start a debug window of VSCode that automatically reloads on changes.
(Optionally) use command (Ctrl+Shift+P) Debugger: Inspect Editor Tokens and Scopes to find the token identifiers for easier development
Inspiration
This theme is inspired by the Ocean Next theme and Plastic deprioritized punctuation theme and modified to style the sidebar and have a darker background.
Font in the screenshot is 'Monaco'