Help! How can I modify or reduce the spacing between paragraphs

Site URL: https://fernandoagundis.com/precioslocalesminesstyle

Hi, I would like to know how I can modify or reduce the spacing between paragraphs, I mean the line spacing.  

What I'm looking to do is to reduce or eliminate the space that is marked here in the image, without joining or losing the formatting of each text, I'm learning a little about css but I can not finish understanding it, I would appreciate the help of any of you.

I think it is a tool or option that could be added in future updates.

It is default heading 3 margin, you can add this to Design > Custom CSS

h3 {
	margin-top: 0px !important;
	margin-bottom: 0px !important;
}