[ahurle]

Agreed on highlighting with a different background color. Unfortunately, it can be difficult to find a background color that is different-enough from the usual background while maintaining a high enough contrast with the text sitting on top of it. This is especially true if your syntax highlighting color palette covers all the hues you could use.

So here's another protip: Make the highlight pop with a brighter left-border, so your background color doesn't have to pop so much on its own and you have more wiggle room to maintain contrast. Something like what mdx-prism has in their readme image [1], though I don't like the specific blue-on-blue colors. This blog article [2] has an example in the middle with nicer colors.

[1]: https://github.com/j0lv3r4/mdx-prism

[2]: https://leerob.io/blog/mdx