Margin of a slideshow

I have a next-gen slideshow in my home page. And I don’t know how to control the margin at the bottom of it.

When the browser is 768px width or more it’s ok, but when it’s smaller there’s a lot of space between the slideshow and the section below it.

How can I solve it?, can I fix a margin?

Here’s the url: http://www.magiamajara.com/

Thanks a lot!

https://wordpress.org/plugins/nextgen-gallery/