[Wtgo Theme] add space/line between comments?

I’m trying to add a bit of space or a dividing line between comments on my husband’s blog, paultobin.net. Is there maybe some easy bit of code to drop into the CSS or something to add space after the tags?

Add the below code in your theme’s style.css. It will add margin (spacing) and border foreach comment.

#commentlist li {
 border-bottom: 1px solid #BFA78F;
 margin:1em 1.2em
}