I am running on my local server – so it is not online – but all I have done is insert a picture as a feature image, it appears in the slider, and the slider has the original blue border, but it also has a while border inside that seems to have a fixed width at the top and left side, a smaller width at the right side, and is cut off at the bottom. When I change the image size, the border on the top and left remains the same.
