Remove white border (see images)

Hey Unity devs,

I have been at this for hours. As you can see in the pictures there’s a white border around the images in my shop menu. I managed to remove the border by setting the “Reference Pixels Per Unity” to 0 in Canvas Scaler - however setting this to 0 also removes the sliced image effect that I use for buttons etc. so in the end this was not a correct solution.

Are there anyone who have had a similar issue and know a fix?

Reference Pixels Per Unit*