Slider size

Well looking at your slider – see screenshot here:
https://gyazo.com/bb86799c7d0e84e3e74cc1c784f3ae4b
I don’t see the issue?
There is no extra space padding below or above the slider images?

Perhaps I’m not making myself clear. I would like the entire slider to be 50% thinner in size rather than the padding top or bottom.

Please use terms like ‘width’ and ‘height’ (and not ‘thinner’ because that could be applied both ways ?? )

I’m thinking now you want to reduce the width of the the slider to 50% of the available page width. You can do this with the following CSS:
#slider_4371 { width:50% !important; }

Sorry I did mean the height