My example was reducing the space between paragraphs while your example is trying to reduce the space between lines in a paragraph. You could try adding a line-height as in the code block below (and yes, I ended up using 0.9 to reduce the line height (see the attached images for the effect of adding the line-height). I also tried 0.75 but that made the text a bit tight for my preferences.
Code:
p {
margin-top: 0px;
margin-bottom: 5px;
padding: 0px;
line-height: 0.9;
}