Trying to remove space between widgets

I am using Page Builder to make my landing page. It’s all done, except for a slight appearance issue i’m trying to address.

https://www.ckmartialhearts.com/learn-kung-fu-in-china/

Between ‘click images below for more information’ and the grey boxes with the images, the white space is really to much. I’ve tried using:

#main {
margin-bottom: 10px;
}

But nothing seems to affect that white space.

Suggestions would be appreciated.

https://www.ads-software.com/plugins/siteorigin-panels/