Hi Ben,
You are correct that it’s best to leave the bp stylesheet in place so that you get updates to that file. You can add a custom stylesheet, though, and increase the selector power of the rule, so that it overrides the bp.css rule, like .site #buddypress #item-body { border-left: none; }
Here’s the basic concept.
https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity
Adding a stylesheet:
Including CSS & JavaScript
Thanks, David,
This is exactly what I needed.
Regards,
Ben