Reduce margin / padding between widgets

Dear all, so I’ve used SiteOrigin’s page builder to edit my page, I’d like to know what are the CSS codes to reduce the gap between the widgets? e.g. The Page Loop and the Post Carousell.

Also, I’d like to reduce the bottom margin as well so that the bottom row sticks to the footer credits. Maybe just a 5px margin.

Thank you in advance.

The theme I’ve used is Totomo. The link to my site is at the previous support thread.