My team thinks it's sometimes difficult to see the swimlane separators that groups the issues. From images online it seemed to once look better. So I'm wondering if it's possible to customize this layout somehow, using css or whatever? I've attached an image on how it used to look which we think at least look better and how it looks in our system currently.
How I want it to look, note the nice boxes around the username separators:

How it currently looks:

If someone could guide me in the direction of what files to modify it would be highly appriciated.
Cheers,
Andreas