Carousel off-centre

When I set a max height of 50% to my carousel, nothing happens. I have to set the max width instead, but the whole carousel goes off-centre to the left and I am unable to move it back centrally?

Anyone got a workaround for this?

EDIT: Solution: Thanks @Flashman Carousel image size help

I never set the margin to auto, and set the actual image inside the carousel to a fixed width, but now the carousel icon are way too far apart and invisible.

EDIT 2: Changed the carousel arrows and all is perfect!