Github Light Theme
Try this theme if others don't meet your needs.
Origin pure white background: Github Light Theme
Gray background: Github Light Theme - Gray
If you are using MacBook, and your system is macOS 10.14+, these global settings will give you a better experience.
The code syntax theme was ported from https://github.com/primer/github-syntax-light. Which is licensed under MIT. Copyright of the code syntax theme belongs to GitHub, Inc.