Remove space between rows & widgets

Hi there,

I’ve been searching your forum for hours (actually days), but I’m giving up now.
I’m using Moesia Theme and have been building my site completely with PageBuilder.
I’m having some issues with the spacing between rows and widgets, as it’s too wide, especially between widgets that are put within the same row.

Having tried several options to remove this space, I don’t know what to do:
Put SiteBuilder settings > Row/Widget Bottom Margin to 0 px, but nothing changed.
Also tried PageBuilder settings > Widgets > Enable Widget class > disabled, but that removed all the layout from the widgets and was too much hassle to reset manually for each widget.
Tried to copy some codes found in other threads into Row > edit > CSS styles, but didn’t help. (It did however in another case, making a widget more transparant on its background, so I know I’m not entirely stupid)
Not sure where I can find and edit Custom CSS for this theme, so a bit lost there however.
I’m not a coder… I’m open to try a few (new) things, but nothing much…

Site is: www.woordverwoord.be
Especially looking at “contact” the spacing between the headers and body is horrible.

Also: how can I make the widget Features have an alignment to the left instead of center (see footer block A > I want this aligned to the left)

Please help?
Thxxxx,
Natascha