Highlighting is different from github.com

[Lengyue57]

This theme has some differences from github.com
example:

1. css highlight

   • github:
     

   • vscode:
     

2. operators and formal parameter

   • github:
     

   • vscode:
     

version: 6.3.4

Some of them are better than github, but some of them look like work-in-progress.
I have tried to clone and change this repo, Improve is not difficult.
Are there any other obstacles?
Or is it by design?
Can I try to contribute it?