White border on photo slider

Hi guys, hoping I may get some quick help with this small issue. Its been doing my head in.

I’m using carsonline theme with a photo-slider on the front main page, its great and works fine except for this white border on the bottom of the pictures which for some reason i cant get rid of.

I’ve tried re-sizing all my pictures, that didn’t help. Im thinking there must be a option somewhere to either black out that white strip or change the size of the slider but I cant seem to find what I need to edit anywhere.

If anyone wants to have a look, websites at https://www.sydneyportlogistics.net.au

Any help would be appreciated! ??

Thx