Strange Outline Custom Arrows Carrousel

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Hi!

I didn't find any informations on existing postings so I hope I won't annoy you with this topic.

I have a question regarding custom arrows for carrousels:
When uploading a SVG as custom arrow I always have a strange, black outline. I have no idea how to get rid of it.

Please check on my about section on my website: http://fredericschlosser.de/about/

You have to hover the making of pictures on the bottom.

Do have any idea what I could do?

Thanks a lot, appreciate it!

Frederic

EDIT: I just found out that this problem only appears on a screen with high resolution (e.g. 5k iMac). On my 2560px screen it looks totally fine. So it's even stranger. Anything I could do?

Dear @liquish
I cannot reproduce it, can you send a screenshot?
Best!
Marius