Margin between two PiS

Hi. In my opinion Your plug-in is one of the best on WP market. So many options and possibilities to arrange posts is great.
I am using plug-in for creating first page and I have three widgets in row. How can I add some space or margins between this plug-ins. My problem You can see at http://mario.horvat.si

Many thanks in advance, Mar

https://ww.wp.xz.cn/plugins/posts-in-sidebar/