Issue Summary

This is reproducible on Data Center: no

Steps to Reproduce

1. create a readme file 
2. add this line and change to dark mode

> NOTE: The EpicReact.dev videos were recorded with React version ^16.13 and all
> material in this repo has been updated to React version ^18. Differences are
> minor and any relevant differences are noted in the instructions.

Expected Results

The lines should be visible

Actual Results

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available