title: Customizing syntax highlighting in Visual Studio Code
body: <p>I'm currently trying to write an extension for a new file type (ANTLR) and wonder how to change the colors used for syntax highlighting in Visual Studio Code. To me it looks as if that is not defined in the extension, but somewhere else. There is no preferences entry for colors nor did I find a CSS file which defines that (which I'd expect since vscode is using Electron). I also looked through the settings file vscode generated and files that came with it, but no clue either. Neither did a web search help. So, I'm kinda lost now.</p>
  
  <p>Can someone give me some hints or point me to the relevant docs?</p>