For example, see https://loaders.gl/docs/developer-guide/polyfills
A contrast checking extension reads the following:
| Color |
Contrast |
| #C5C8C6 |
1.57 |
| #B5BD68 |
1.88 |
| #8ABEB7 |
1.94 |
I think the issue is the file modules/gatsby-theme-ocular/styles/markdown/b16-tomorrow-dark.css - per the name it's for a dark theme, but that's not what Ocular uses. Code blocks should either have a dark background to bring the contrast up or switch the code styling to a light theme.