Useful if you use Bootstrap v5 CDN and don't use Sass files in your project.
In Bootstrap 5 Docs you can find that negative margins are disabled by default and you can enable them with Sass variables. If you need pure CSS classes you can use this repo.
You can just integrate these classes in the bootstrap.min.css file (unminify it and look for each media query, insert these classes and minify it again, or simply add them at the end of the file) or copy them in your own style.css.
In VsCode "Comment Anchor" Extension can help to navigate the file.
Hope it can help! 🎁 🆘 😊