Reduce Slideshow Gallery Height

Website: https://www.big-impact.com/
Password: bigimpact

Hey guys,

I'm looking to reduce the height of the slideshow gallery on the homepage of this website. It's currently at the minimum height but there's still too much white space above and below the logos.

I've got my fingers crossed that one of you will be able to help me with some custom CSS to reduce it.

Thank you!